tetrasodium 5-[[4'-[[2,6-diamino-4-[[8-hydroxy-3,6-disulphonato-7-[(4-sulphonato-1-naphthyl)azo]-2-naphthyl]azo]phenyl]azo]-3,3'-dimethyl[1,1'-biphenyl]-4-yl]azo]salicylate

5-[[4'-[[2,6-Diamino-4-[[8-hydroxy-3,6-di(sodiosulfo)-7-[[4-(sodiosulfo)-1-naphthalenyl]azo]-2-naphthalenyl]azo]phenyl]azo]-3,3'-dimethyl[1,1'-biphenyl]-4-yl]azo]-2-hydroxybenzoic acid sodium salt