Diethylene glycol

Diethylene glycol
Diethylene glycol
CAS number 111-46-6 YesY
PubChem 8117
ChemSpider 13835180 YesY
UNII 61BR964293 YesY
KEGG C14689 YesY
ChEBI CHEBI:46807 YesY
Jmol-3D images Image 1
Molecular formula C4H10O3
Molar mass 106.12 g/mol
Appearance Colorless liquid
Density 1.118 g/mL
Melting point

–10.45 °C

Boiling point

244–245 °C

Solubility in water miscible
MSDS Diethylene-glycol MSDS
Related compounds
Related diols ethylene glycol, triethylene glycol
 YesY glycol (verify) (what is: YesY/N?)
Except where noted otherwise, data are given for materials in their standard state (at 25 °C, 100 kPa)
Infobox references

Diethylene glycol (DEG) is an organic compound with the formula (HOCH2CH2)2O. It is a colorless, practically odorless, poisonous, and hygroscopic liquid with a sweetish taste. It is miscible in water, alcohol, ether, acetone, and ethylene glycol.[1] DEG is a widely used solvent.[2] Its use in adulterated consumer products has resulted in numerous epidemics of poisoning since the early 20th century.[1]



DEG is produced by the partial hydrolysis of ethylene oxide. Depending on the conditions, varying amounts of DEG and related glycols are produced. The resulting product is two ethylene glycol molecules joined by an ether bond.[3]

"Diethylene glycol is derived as a co-product with ethylene glycol and triethylene glycol. The industry generally operates to maximize MEG production. Ethylene glycol is by far the largest volume of the glycol products in a variety of applications. Availability of DEG will depend on demand for derivatives of the primary product, ethylene glycol, rather than on DEG market requirements."[4]

Structure of DEG and related polyols

Diethylene glycol is one of several glycols derived from ethylene oxide. Glycols related to and coproduced with diethylene glycol and have the formula HOCH2CH2(OCH2CH2)nOH are:

These compounds are all hydrophilic, more so than most diols, by virtue of the ether functionality.


Diethylene glycol is used in the manufacture of unsaturated polyester resins, polyurethanes, and plasticizers.[1] DEG is used as a building block in organic synthesis, e.g. of morpholine and 1,4-dioxane. It is a solvent for nitrocellulose, resins, dyes, oils, and other organic compounds. It is a humectant for tobacco, cork, printing ink, and glue.[5] It is also a component in brake fluid, lubricants, wallpaper strippers, artificial fog solutions, and heating/cooking fuel.[1] In personal care products (e.g. skin cream and lotions, deodorants), DEG is often replaced by selected diethylene glycol ethers. A dilute solution of diethylene glycol can also be used as a coolant; however, ethylene glycol is much more commonly used. Most ethylene glycol antifreeze contains a few percent diethylene glycol, present as an inadvertent byproduct of ethylene glycol production.


Despite the discovery of DEG’s toxicity in 1937 and its involvement in mass poisonings around the world, the information available regarding human toxicity is limited. Some authors suggest the minimum toxic dose is estimated at 0.14 mg/kg of body weight and the lethal dose is between 1.0 and 1.63 g/kg of body weight,[6] while some suggest the LD50 in adults is of ~1 mL/kg,[1] and others suggest this is the LD30.[3] Because of its adverse effects on humans, diethylene glycol is not allowed for use in food and drugs. The U.S. Code of Federal Regulations allows no more than 0.2% of diethylene glycol in polyethylene glycol when the latter is used as a food additive.[7] The Australian government does not allow DEG as a food additive; it is only allowed at less than 0.25% w/w of DEG as an impurity of polyethylene glycol (PEG)[8] even in toothpaste.[9]

Diethylene glycol has moderate acute toxicity in animal experiments. The LD50 for small mammals has been tested at between 2 and 25 g/kg, less toxic than its relative ethylene glycol, but still capable of causing toxicity in humans. It appears diethylene glycol is more hazardous to humans than implied by oral toxicity data in laboratory animals.[1]


Although there is limited information about toxicokinetics in humans, observations in mass poisonings and experimental studies suggest the following information:

Absorption and distribution

The principal method of absorption is through oral ingestion. Dermal absorption is very low, unless it is administered on broken or damaged skin. After ingestion, DEG is absorbed through the gastrointestinal tract and distributed by the bloodstream throughout the body, reaching peak blood concentrations within 30 to 120 minutes. Once DEG reaches the liver, it is metabolized by enzymes.[1][6]

Metabolism and elimination

At first, scientists thought that DEG metabolized into ethylene glycol, which is poisonous due to the metabolic production of glycolic acid, glyoxylic acid, and ultimately oxalic acid.[10] The major cause of ethylene glycol toxicity is the accumulation of glycolic acid in the body,[11] but the accumulation of calcium oxalate crystals in the kidneys can also lead to acute kidney failure.[10] In the case of DEG, observations demonstrated there were no calcium oxalate crystal deposits in the kidneys, implying ethylene glycol is not on the DEG metabolic pathway. Rat models suggest DEG is metabolized in the liver by enzyme NAD-dependent alcohol dehydrogenase (ADH) into a hydrogen ion, NADH and 2-hydroxyethoxyacetaldehyde (C4H8O3). Shortly after, 2-hydroxyethoxyacetaldehyde (C4H8O3) is metabolized by the enzyme aldehyde dehydrogenase (ALDH) into the weak acid 2-hydroxyethoxyacetic acid (HEAA) with chemical formula C4H8O4. Later on, HEAA leaves the liver through the bloodstream, being partially filtered in the kidneys for elimination.[1][6]

Mechanisms of toxicity

Based on available literature, scientists suggest unmetabolized DEG and HEAA are partially reabsorbed through glomerular filtration. As a consequence, the concentrations of the weak acid HEAA and metabolites may cause renal delay, leading to metabolic acidosis and further liver and kidney damage.[1][6]


The symptoms of poisoning typically occur in three characteristic intervals:[1]

  • First phase: Gastrointestinal symptoms, such as nausea, vomiting, abdominal pain, and diarrhea, develop. Some patients may develop early neurological symptoms like altered mental status, central nervous system depression, coma and mild hypotension.
  • Second phase: In one to three days after ingestion (and dependent on dose ingested), patients develop metabolic acidosis, which causes acute kidney failure, oliguria, increasing serum creatinine concentrations, and later anuria. Other symptoms reported and secondary to acidosis and/or renal failure are: hypertension, tachycardia, cardiac dysrhythmia, pancreatitis, hyperkalemia or mild hyponatremia.
  • Final phase: At least five to 10 days after ingestion, most of the symptoms are related to neurological complications, such as: progressive lethargy, facial paralysis, dysphonia, dilated and nonreactive pupils, quadriplegia, and coma leading to death.


Although it is not an approved procedure and no studies support successful removal of DEG, patients are subject to hemodialysis once diagnosis is made. Hemodialysis might be administered alone or with ethanol or fomepizole, which are competitive inhibitors of the enzyme NAD-dependent alcohol dehydrogenase (ADH):

  • With no medication: the low molecular weight and little or no plasma protein binding suggest DEG should be removed through this method.[1]
  • With fomepizole: an ADH inhibitor with 8,000 times more affinity than ethanol, this treatment has minimal adverse effects because of constant serum concentration.[3] However, it is a very expensive medication (approximately $3,000 U.S. dollars per treatment).[12]
  • With ethanol: ethanol is an ADH inhibitor used when fomepizole is not available. A constant high blood concentration of ethanol should be maintained to acceptably saturate the enzyme, which can cause ethanol intoxication. To avoid this adverse effect, frequent serum monitoring and dosage adjustment is necessary.[1]

For late diagnosis where ethanol or fomepizole is ineffective, because DEG has already been metabolized, hemodialysis becomes the only treatment available.[3]


The prognosis depends on prompt diagnosis and treatment due to the high mortality rate DEG intoxication produces. Patients who survive but develop renal failure remain dialysis-dependent. All patients are likely to suffer significant morbidity.[3]


The physical properties of diethylene glycol make it an excellent counterfeit for pharmaceutical-grade glycerine (also called glycerol) or propylene glycol, and has caused many deaths in different countries. It was also used by China as a component of cheap toothpaste and winemakers as an adulterant to create a "sweet" wine.[13][14]

1937 – The Massengill Incident (United States)

In 1937, S.E. Massengill Co. (a Tennessee drug company), manufactured sulfanilamide dissolved with diethylene glycol, to create a liquid alternative of this drug. The company tested the new product, Elixir Sulfanilamide, for flavor, appearance and fragrance. At the time, the food and drug laws did not require toxicological analysis before releasing for sale. When 105 people died in 15 states during the months of September and October, the trail led back to the elixir, and the toxic potential of this chemical was revealed.[15][16][17] This episode was the impetus for the Federal Food, Drug, and Cosmetic Act of 1938.[18] This law, though extensively amended in subsequent years, remains the central foundation of FDA regulatory authority to the present day.[19]

1969 – South Africa

In Cape Town, South Africa, seven children developed vomiting, diarrhea and dehydration, and died of renal failure after administration of over-the-counter sedatives. Soon, patients started to present anuria, acidic breathing, hepatomegaly and unresponsiveness. Patients were treated with fluid hydration and correction of acidosis, but some were not able to survive. Postmortem examination revealed damage in kidneys and liver, and laboratory testing found DEG instead of propylene glycol in the sedatives.[1][18]

1985 – Spain

Patients being treated for burns developed sudden anuric renal failure. Further investigation revealed all patients were treated with topical silver sulfadiazine ointment that contained 7 g/kg of DEG. This event caused the death of five patients.[3][20][21]

1985 - Wine Scandal

During the month of July 1985, Austrian wines were found to contain up to 1,000 parts per million of DEG, giving them a desirable sweetness characteristic. The news spread throughout the world, where many countries performed massive wine recalls. As a result, the U.S. Bureau of Alcohol, Tobacco and Firearms started to test all imported wine.

In November, The New York Times published a wine recall that the Federal Government released after the Bureau of Alcohol, Tobacco and Firearms tested 1,000 bottles. 45 Austrian, 5 German and 12 Italian wines tested positive for DEG. Some wines contained less than 10 parts per million of DEG, a small amount that could not be detected by laboratory analysis in Europe. This triggered the installation of more sensitive laboratory equipment in Banafi laboratories, Italy, and stronger alcohol regulations in Austria.[22][23][24]

After recalling millions of wine bottles, the Austrian Government had no idea how to destroy the product. During September 1986, the Ministry of Public Works started testing a mixture of wine with salt to melt hazardous ice during winter. The primary results revealed that the mixture was more effective than using salt alone.[25] The next year, an Austrian electric power plant (Oesterreichischen Draukraftwerke) in Carinthia announced that technicians developed a way to produce energy through burning 30 million liters of contaminated wine.[26]

1986 – India

At a hospital in Bombay, India, patients were admitted to be treated for diverse health problems. Doctors prescribed glycerine for its osmotic diuretic effect, but patients started to develop renal failure. Fourteen patients received hemodialysis, but the treatment failed. The episode resulted in the deaths of 21 patients and the discovery of glycerin contaminated with 18.5% v/v of DEG.[1][18][27]

1990 - Nigeria

During the summer months, 47 children were admitted to the Jos University teaching hospital, Nigeria, with anuria, fever and vomiting. The children later developed renal failure and died. All the children had received acetaminophen syrup to treat upper respiratory infections related with malaria. Once physicians identified a suspect paracetamol syrup, samples were shipped to Centers for Disease Control and Prevention (CDC), which identified DEG. It was assumed that DEG was used as a substitute of propylene glycol, and this incident encouraged the Nigerian government to develop pharmaceutical quality control guidelines.[1][18][28][29]

1990-1992 - Bangladesh

In Bangladesh between 1990 and 1992, 339 children developed kidney failure, and most of them died, after being given paracetamol (acetaminophen) syrup contaminated with diethylene glycol. The outbreak forced the government to ban the sale of paracetamol elixirs in December 1992, causing a decline of 53% in the admission of patients with renal failure and a 84% decline in admissions by unexplained renal failure.[30]

1992 - Argentina

A propolis syrup manufactured by Huilen Laboratories in Buenos Aires, Argentina, contained between 24 and 66.5% DEG, and caused the death of 29 persons.[31][32][33]

1995-1996 - Haiti

In the poorest country in the Western Hemisphere, diseases are not recognized unless they become large or unusual. Between November 1995 and June 1996, almost 109 children admitted to the University Hospital in Port-au-Prince, Haiti, presented with acute renal failure. Epidemiologists discovered the victims had consumed either Afebril or Valodon (acetaminophen preparations), manufactured by the same pharmaceutical company. Due to the strong relationship between the company and the government, the Pan American Health Organization (PAHO); World Health Organization (WHO); the Caribbean Epidemiology Center, and the Centers for Disease Control and Prevention were invited to participate in the investigation.[28][34][35]

After collecting the samples and sending them to the CDC for analysis, experimental trials revealed the presence of DEG in all of the samples. Then, the manufacturer and the Haitian Minister of Health requested identification of the contaminated production lots and percentage of DEG in the syrups. With the available technology of the era, the CDC determined the glycerin used in the syrup preparation was contaminated with approximately 24% DEG.[28] Only 88 children deaths were recalled by doctors or had medical records. Nearly half of the victims were under the age of two.[36]

Ending June 1996, the FDA had discovered counterfeit glycerin traced back to Chemical Trading and Consulting (a German broker), which bought 72 barrels of the syrup from Vos B.V., a Dutch company. Vos records revealed the syrup had been bought from Sinochem International Chemicals Company through a German trader, Metall-Chemie. In July 1996, the American Embassy in China contacted Sinochem and requested a list of Chinese glycerin makers, but the company refused to reveal the names. It was not until September 1996 that Sinochem provided a name of the manufacturer of the tainted syrup. They identified Tianhong Fine Chemicals Factory as the manufacturer. While the FDA tried to find out Tianhong’s address, Chinese officials were reluctant to become involved. One year and a half after the FDA began to trace the poisonous shipments, an inspector, Ted Sze, finally visited the Tianhong Fine Chemicals Factory in Dalian, northeastern China. Once he was inside, there was nothing to do: the plant had already been shut down. The Dutch authorities assessed a $250,000 fine against Vos B.V., for not alerting anyone when they tested the syrup and found impurities.[36]

2006 - China

Wang Guiping discovered how easy it was to enter China’s pharmaceutical supply business and earn extra money. Records also revealed that to fool buyers, Wang falsified his license and laboratory analysis reports.

Wang declared that after making the first order of counterfeit syrup, he swallowed some of it. Once verifying that he was fine, he shipped it to Qiquihar No. 2 Pharmaceutical in 2005. Some time later, Wang found a reference to diethylene glycol in a chemical book. After manufacturing a second batch of syrup containing diethylene glycol for Qiquhar Pharmaceutical, no taste-test was performed. The counterfeit syrup ended in ampules of Amillarisin A, a medication for gall bladder problems; special pediatric enema fluid; blood vessel disease injections; intravenous pain reliever; and an arthritis medication.

In April 2006, the Guangdong Province Hospital of Guangzhou began administering Amillarisin A to their patients. Soon thereafter, patients died after receiving the medication. Mr. Wang was caught and Qiquihar was shut down by the authorities. Besides Wang, five employees of Qiquihar were prosecuted.[37]

2006 - Panama

Ending September 2006, the Arnulfo Arias Madrid Hospital at Panama City was getting full with patients with contradictory symptoms. The symptoms seemed to match with Guillain-Barré syndrome, but these patients were also losing their ability to urinate, a symptom not related to Guillain-Barré. The death rate of this mysterious illness was nearly 50%, when hospital management decided to isolate all the patients with the illness in a large room and doctors could compare notes and theories. Soon, patients from other parts of the country started to arrive at hospitals. Doctors had no idea what was happening: the mysterious illness was attacking elderly citizens with hypertension and diabetes history. About half were receiving Lisinopril (a blood pressure medicine), and many did not remember clearly if they had been taking other drugs. Suspecting something wrong with Lisinopril, the medicine was removed from the pharmacies[37] while the U.S. Food and Drug Administration conducted lab analyses, revealing the blood pressure drug was safe; CDC epidemiologists were then invited to participate.[28]

When a patient admitted for a heart attack developed the mysterious illness at the hospital, Dr. Nestor Sosa, an infectious disease specialist, analyzed the medical record. Because patients treated with Lisinopril developed a cough (a common side effect of ACE inhibitors), they were prescribed an expectorant.[37] Immediately, biological samples and the syrup were sent by jet to CDC for analysis. When urine analyses for a series of metals, pesticides or their metabolites resulted negative, CDC scientists recalled the Nigeria and Haiti incidents. The CDC employed modern laboratory equipment to analyze the samples and confirm the results: the samples contained approximately 8% v/v DEG. Later, raw glycerin was analyzed and results revealed 22.2% v/v DEG.[28]

The Panamanian Government made a nationwide campaign, collecting around 6,000 bottles of cough syrup and three other products with the tainted glycerin manufactured by Social Security Laboratories.[38] The 46 barrels of syrup were bought by Social Security Laboratories through a Panamanian middleman, Grupo Comercial Medicom, who bought the product from Rasfer Internacional, a Spanish company. In fact, Rasfer received the product from CNSC Fortune Way, which in turn bought it from the Taixing Glycerine Factory. At the request of the United States, the State Food and Drug Administration of China investigated Taixing Glycerine Factory and CNSC Fortune Way, but the agency concluded it is not under their jurisdiction because the factory is not certified to make medicine.[37][39]

Taixing sold the syrup as “TD glycerin”, wording that neither Chinese inspectors nor Spanish medical authorities comprehended. Unfortunately, Taixing used “TD” for the Chinese word tidai, meaning “substitute”.[37] A New York Times reporter tried to obtain a comment from CNSC Fortune Way at the CPhI worldwide (the world’s largest annual pharmaceutical convention) held in Milan, Italy, during 2007, but their representatives refused to comment.[40]

In August 2009, the Supreme Court decided to send the diethylene glycol file to the Public Ministry for an extension.[41] The following month, the Toxicology Department of the Institute of Legal Medicine and Forensic Science published a list of 1,155 names whose medicine bottles tested positive for DEG. Only approximately 3,000 bottles had been analyzed from the total 6,000 bottles collected. The fiscal attorney urged affected citizens to approach the Public Ministry to update the official legal file and for further medical analysis.[38] Two months later, findings revealed that 145 were proven to die by DEG intoxication, but the DA still has to investigate 953 demands.[41]

The New York Times reported that Taixing was closed by the Chinese government and CNSC Fortune Way was never sanctioned, which is also owned by the Chinese government.[40] In Spain, Rasfer International declared bankruptcy after the lawyer of Medicom filed a lawsuit of $400 million in July 2008.[42] Spanish authorities are prosecuting Asunción Criado, general manager of Rasfer Internacional, S.A., and await Panamanian citizens, René Luciani (former Social Security Director) and Jéssica Rodríguez (former Purchase National Director) for their hearings. Meanwhile, in Panama, De la Cruz, legal representative of Medicom, remains in jail pending a trial. Seventeen other persons have also been charged related to this incident. Panama awaits the extradition of Criado for her hearing.[43]

Panama’s case made CDC set standardized methodology for DEG identification, hoping to have more timely response in future events. The agency also identified urinary DEG as a biomarker for DEG exposures.[28] The United States Food and Drug Administration also issued an Industry Guidance Document “intended to alert pharmaceutical manufacturers, pharmacy compounders, repackers, and suppliers to the potential public health hazard of glycerin contaminated with diethylene glycol (DEG)” and recommended appropriate testing procedures for the use of glycerin.[44]

During June 2011, the number of confirmed deaths according to the official list rose to 219 victims [45]

2007 - Worldwide toothpaste incident

The mass recall of four different medicines in Panama taught citizens that DEG is harmful. In May 2007, a Panamanian named Eduardo Arias discovered a 59-cent toothpaste that was labeled containing DEG. Panamanian officials traced the toothpaste to a local company in the Colón Free Trade Zone. In fact, the company bought the product in China and had already re-exported toothpaste to Costa Rica, Dominican Republic and Haiti, making Panama kick off a local warning.[46][47][48] For the end of the month, the Chinese government committed to investigate the “supposedly” tainted toothpaste that had been recalled in Panama and Dominican Republic, but stated that, as per an essay written in 2000, a toothpaste containing 15.6% was not dangerous.[49]

On June 1, 2007, the FDA warned consumers to avoid toothpaste from China, although there was no information if these toothpastes had already entered the US, and started testing any imported Chinese toothpaste.[50][51] Days later, Colgate-Palmolive found counterfeit toothpaste with its name, which was contaminated with DEG and found at dollar-type discount stores in New York, New Jersey, Pennsylvania and Maryland. The toothpaste was labeled as “Manufactured in South Africa” and contained misspellings like "isclinically", "SOUTH AFRLCA" and "South African Dental Assoxiation".[52][53] Although there were no reports of anyone harmed, several people in the eastern US reported experiencing headaches and pain after using the product.[54] It was later discovered that a great number of tubes with poison ended up in hospitals for the mentally ill, prisons, juvenile detention centers, other hospitals and many other state institutions.[55]

In July 2007, England detected a counterfeit Sensodyne toothpaste on sale at a car boot in Derbyshire.[56] Soon, authorities in Belize, Canada, Mozambique, Saudi Arabia, New Zealand, Spain, Italy, Japan, Ireland and an Indianapolis, Indiana US hotel supplier that distributed Chinese toothpaste in Barbados, Belgium, Bermuda, Britain, Canada, Dominican Republic, France, Germany, Ireland, Italy, Mexico, Spain, Switzerland, Turks and Caicos, the United Arab Emirates and United States were also recalling Chinese-made toothpaste. What began as a local alert revealed a global problem in more than 30 countries and involving more than thirty brands.[57] The world outcry made Chinese officials ban the practice of using diethylene glycol in toothpaste.[58]

2008 - Nigeria

Ending November 2008, infants started to die after developing unexplained fevers and vomiting.  Investigations revealed that all had taken a medicine called “My Pikin Baby”, a teeth mixture tainted with diethylene glycol. The poison had caused the death of at least 84 Nigerian children between ages of two months and seven years.[59][60]

The Nigerian government traced the diethylene glycol to an unlicensed chemical dealer in Lagos, who sold it to a local pharmaceutical manufacturer. Barewa Pharmaceuticals was shut down and the product was pulled off the shelves. They also arrested 12 people in connection with the incident. Being the second incident involving counterfeit glycerine, the Nigerian National Agency for Food And Drug Administration and Control (NAFDAC) had become zero-tolerant against counterfeits.[61][62][63]

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  46. ^ Bogdanich, W.; McLean, R. "Poisoned Toothpaste in Panama Is Believed to Be From China", New York Times, May 19, 2007.
  47. ^ "China investigating toothpaste containing potentially deadly chemical". International Herald Tribune. 2007-05-22. Retrieved 2007-05-22. 
  48. ^ "U.S. checking all toothpaste imports from China". CNN. 2007-05-23. Archived from the original on 2007-05-26. Retrieved 2007-05-23. 
  49. ^ Xiaomin, X and Hongyi, W. (2007-05-24). "Gov't probes 'tainted toothpaste' case". China Daily. Retrieved 2009-12-10. 
  50. ^ Bogdanich, W. "Toxic Toothpaste Made in China Is Found in U.S. ", New York TImes, June 2, 2007.
  51. ^ U.S. Food and Drug Administration Press Release. "FDA Advises Consumers to Avoid Toothpaste From China Containing Harmful Chemical. FDA Detains One Contaminated Shipment, Issues Import Alert", June 1, 2007.
  52. ^ Colgate Palmolive Company Press Release. "Counterfeit Colgate Toothpaste Found", June 14, 2007.
  53. ^ U.S. Food and Drug Administration Press Release. "Counterfeit Colgate Toothpaste Found", June 14, 2007.
  54. ^ Toothpaste recall expands 6/18/07
  55. ^ Bogdanich, W. "Wider Sale Is Seen for Toothpaste Tainted in China ", New York Times, June 28, 2007.
  56. ^ "Toxin found in fake UK toothpaste". BBC News. July 12, 2007. Retrieved May 1, 2010. 
  57. ^ "Tainted toothpaste across the world", New York Times, September 30, 2007.
  58. ^ Bogdanich, W. "The Everyman Who Exposed Tainted Toothpaste", New York Times, October 1, 2007.
  59. ^ Nigeria child deaths from tainted syrup rise to 84
  60. ^ Nigeria child deaths from tainted syrup rise to 84
  61. ^ "Nigeria: 12 Held Over Tainted Syrup". The New York Times. February 12, 2009. Retrieved May 1, 2010. 
  62. ^ Polgreen, Lydia (February 7, 2009). "84 Children Are Killed by Medicine in Nigeria". The New York Times. Retrieved May 1, 2010. 
  63. ^ NAFDAC Negotiates State of the art Anti Counterfeiting Equipment


  • Merck Index, 12th Edition, 3168.

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