2-Hydroxy-5-[[4-[[6-hydroxy-2-[3-[(1-hydroxy-4-sodiosulfo-2-naphthalenyl)azo]phenyl]-8-sodiosulfo-1H-naphth[1,2-d]imidazol-7-yl]azo]benzoyl]amino]-3-methylbenzoic acid sodium salt
2-Hydroxy-5-[[4-[[6-hydroxy-2-[3-[(1-hydroxy-4-sodiosulfo-2-naphthalenyl)azo]phenyl]-8-sodiosulfo-1H-naphth[1,2-d]imidazol-7-yl]azo]benzoyl]amino]-3-methylbenzoic acid sodium salt