Citrazinic acid

Citrazinic acid
Other names 2,6-Dihydroxyisonicotinic acid; 2,6-Dihydroxypyridine-4-carboxylic acid
Identifiers
CAS number	99-11-6
Properties
Molecular formula	C6H5NO4
Molar mass	155.11 g/mol
Appearance	yellow powder
Melting point	>300 °C (decomp.)
Solubility in water	Slightly, with hydrolysis
Y (verify) (what is: Y/N?) Except where noted otherwise, data are given for materials in their standard state (at 25 °C, 100 kPa)
Infobox references

Citrazinic acid is a heterocyclic compound consisting of a dihydropyridine ring derived from citric acid. The yellow solid exists as multiple tautomers; as seen also for the simpler 2-pyridone.

Citrazinic acid is very sparingly soluble in water, acid and methanol but is soluble in basic solutions (eg. ammonia water). For NMR purposes it is also sparingly soluble in d6-DMSO (2H, 6.20 ppm).