- Orange GGN
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Orange GGN 
Other names1-(m-sulfophenylazo)-2-naphthol-6-sulfonic acid, disodium saltIdentifiers CAS number 2347-72-0 ChemSpider 20152418 
Jmol-3D images Image 1 - [Na+].[Na+].[O-]S(=O)(=O)c1cccc(c1)/N=N/c2c3ccc(cc3ccc2O)S([O-])(=O)=O
- InChI=1S/C16H12N2O7S2.2Na/c19-15-7-4-10-8-13(27(23,24)25)5-6-14(10)16(15)18-17-11-2-1-3-12(9-11)26(20,21)22;;/h1-9,19H,(H,20,21,22)(H,23,24,25);;/q;2*+1/p-2/b18-17+;;
Key: CECHAJXICNIUQL-QIKYXUGXSA-L
InChI=1/C16H12N2O7S2.2Na/c19-15-7-4-10-8-13(27(23,24)25)5-6-14(10)16(15)18-17-11-2-1-3-12(9-11)26(20,21)22;;/h1-9,19H,(H,20,21,22)(H,23,24,25);;/q;2*+1/p-2/b18-17+;;
Key: CECHAJXICNIUQL-JLAJEUQUBK
Properties Molecular formula C16H10N2Na2O7S2 (disodium salt) Molar mass 452.369 g/mol 
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Except where noted otherwise, data are given for materials in their standard state (at 25 °C, 100 kPa)Infobox references Orange GGN, also known as alpha-naphthol orange, is a food dye. In Europe it is denoted by the E Number E111. It is the disodium salt of 1-(m-sulfophenylazo)-2-naphthol-6-sulfonic acid. It is currently delisted in Europe and USA, because toxicological data has shown it is harmful.
The absorption spectrum of Orange GGN and Sunset Yellow is nearly identical in visible and ultraviolet range, but they can be distinguished by their IR spectra.
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