Scarlet GN

Scarlet GN, or C.I. Food Red 2, FD&C Red No. 4, or C.I. 14815 is a red azo dye once used as a food dye. As a food additive, it has the E number E125. It is usually used as a disodium salt.

Scarlet GN

Kekulé, canonical skeletal formula of scarlet GN ((6E)-6-hydrazinylidene)
Names
Systematic IUPAC name Disodium 3-[(2,4-Dimethyl-5-sulfonatophenyl)hydrazinylidene]-4-oxonaphthalene-1-sulfonate
Other names Crimson 4R C.I. Food Red 1 Food red 1 FD & C Red no. 4 Hexacol Ponceau SX Maple Ponceau SX Ponceau SX Purple 4R E125
Identifiers
CAS Number	4548-53-2 (Z) N
3D model (JSmol)	Interactive image Interactive image
ChemSpider	5020702 (Z) N
ECHA InfoCard	100.019.870
EC Number	221-856-3
E number	E125 (colours)
PubChem CID	6537642 (Z) 5483118 (E)
UNII	X3W0AM1JLX N
CompTox Dashboard (EPA)	DTXSID9062938
InChI InChI=1S/C18H16N2O7S2.2Na/c1-10-8-11(2)17(16(9-10)29(25,26)27)20-19-14-7-6-12-13(18(14)21)4-3-5-15(12)28(22,23)24;;/h3-9,20H,1-2H3,(H,22,23,24)(H,25,26,27);;/q;2*+1/p-2/b19-14-;; N Key: AQJHOKDCKYSJAS-MHZTUVSFSA-L N
SMILES [Na+].Cc3cc(S(=O)(=O)[O-])c(N=Nc2c(O)c1c(cc2)c(S(=O)(=O)[O-])ccc1)c(C)c3.[Na+] CC1=CC(=C(NN=C2C=CC3=C(C=CC=C3C2=O)S(=O)(=O)O[Na])C(C)=C1)S(=O)(=O)O[Na]
Properties
Chemical formula	C18H14N2Na2O7S2
Molar mass	480.42 g·mol−1
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). N verify (what is YN ?) Infobox references

In the United States, it is not permitted for use in food or ingested drugs and may only be used in externally applied drugs and cosmetics, due to potential carcinogenic effects from ingesting it.^[1][2][3] An exception was added in 1965 to allow its use in the coloring of maraschino cherries, which were considered mainly decorative and not a foodstuff.^[4] This exception was repealed and the dye banned in the US on September 22, 1976 due to mounting safety concerns.^[5] In the European Union, it is not permitted as a food additive.^[6]