Synonyms: 1-Phenol-4-sulfonicacid, 2-[cyano(2-hydroxy-5-sulfophenylazo)methylene]hydrazino- (6CI);Benzenesulfonic acid, 3,3'-(3-cyano-1,5-formazandiyl)bis[4-hydroxy- (8CI);Benzenesulfonic acid,3-[[cyano[(2-hydroxy-5-sulfophenyl)azo]methylene]hydrazino]-4-hydroxy-(7CI,9CI); 1,5-Bis(2-hydroxy-5-sulfophenyl)-3-cyanformazan;1,5-Bis(2-hydroxy-5-sulfophenyl)-3-cyanoformazan;1,5-Di-(2-hydroxy-5-sulfophenyl)-3-cyanoformazan; Cyanoformazan 2;N,N-Bis(2-hydroxy-5-sulfophenyl)-C-cyanoformazan;N,N'-Bis(2-hydroxy-5-sulfophenyl)-3-cyanoformazan; N,N'-Bis(2-hydroxy-5-sulfophenyl)-C-cyanoformazan;N,N'-Bis(2-hydroxy-5-sulfophenyl)-C-cyanoformazan
