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

5-[[4'-[[8-Amino-7-[[5-amino-2-[[4-[(sodiooxy)sulfonyl]phenyl]azo]phenyl]azo]-1-hydroxy-3,6-bis[(sodiooxy)sulfonyl]naphthalen-2-yl]azo]-1,1'-biphenyl-4-yl]azo]-2-hydroxybenzoic acid sodium salt