Indigo Carmine

1H-Indole-5-sulfonic acid, 2-(1,3-dihydro-3-oxo-5-sulfo-2H-indol-2-ylidene)-2,3-dihydro-3-oxo-, sodium salt (1:2); 1H-Indole-5-sulfonic acid, 2-(1,3-dihydro-3-oxo-5-sulfo-2H-indol-2-ylidene)-2,3-dihydro-3-oxo-, disodium salt (9CI); C.I. Acid Blue 74 (6CI); [Δ2,2'-Biindoline]-5,5'-disulfonic acid, 3,3'-dioxo-, disodium salt (8CI); 12070 Blue; 1311 Blue; 5,5'-Indigodisulfonic acid disodium salt; A.F. Blue No. 2; Acid Blue 74; Acid Blue W; Acid Leather Blue IC; Airedale Blue IN; Amacid Brilliant Blue; Aniline Carmine Powder; Ariavit Indigo Carmine; Atul Indigo Carmine; Basovit Blue 665E; Blue 2; Blue No. 2; Bucacid Indigotine B; C.I. 73015; C.I. 75781; C.I. Food Blue 1; C.I. Natural Blue 2; Canacert Indigo Carmine; Carmine Blue; Carmine indigo; Cilefa Blue R; Cogilor Blue 511.11; Disodium 5,5'-indigodisulfonate; Disodium 5,5'-indigotin disulfonate; Dolkwal Indigo Carmine; E 132; Edicol Supra Blue X; Eurocert Indigo Carmine 311811; FD & C Blue 2; FD & C Blue No 2-307045; FD and C Blue 2; FD and C Blue No. 2; FD&C Blue No. 2; FD&C Blue No. 2-37006; Food Blue 1; Food Blue 2; Food Blue No. 1; Food Blue No. 2; Grape Blue A; HD Indigo Carmine; HD Indigo Carmine Supra; Hexacert Blue No. 2; Hexacol Indigo Carmine Supra; Indigo Carmine 307019; Indigo Carmine 36009; Indigo Carmine 37006; Indigo Carmine A; Indigo Carmine AC; Indigo Carmine BP; Indigo Carmine Conc. FQ; Indigo Carmine Powder; Indigo Carmine X; Indigo Extract; Indigo carmine; Indigo carmine 85E132; Indigo carmine E 132; Indigo carmine NB; Indigotin; Indigotin (solubilized); Indigotine; Indigotine B; Indigotine Blue LZ; Indigotine Carmine; Indigotine Extra Pure A; Indigotine I; Indigotine IA; Indigotine Lake; Indigotine N; Indigotine disodium salt; Indocarmine F; Intense Blue; Japan Blue 2; Japan Food Blue No. 2; L Blue Z 5010; Maple Indigo Carmine; Mitsui Indigo Carmine; Necol Indigo Carmine; Neelicol Indigo Carmine; San-ei Indigo Carmine; Sepisperse Dry 1003; Sodium 5,5'-indigodisulfonate; Sodium 5,5'-indigotindisulfonate; Soluble indigo; Soluble indigo blue; Sumitomo Wool Blue SBC; Usacert Blue No. 2; Usacert FD & C Blue No 2-310118; Usacert FD and C Blue No. 2; WAS 35; Water Blue 177557; Water Blue 177558; Indigo carmine; Indigotindisulfonate sodium

InChI=1S/C16H10N2O8S2.2Na/c19-15-9-5-7(27(21,22)23)1-3-11(9)17-13(15)14-16(20)10-6-8(28(24,25)26)2-4-12(10)18-14;;/h1-6,17-18H,(H,21,22,23)(H,24,25,26);;/q;2*+1/p-2/b14-13+;;