4-[(2-Amino-8-hydroxy-6-sodiosulfo-1-naphtyl)azo]-N-phenylbenzenesulfonamide

sodium 6-amino-5-[(4-anilinosulphonylphenyl)azo]-4-hydroxynaphthalene-2-sulphonate

1-[4-(Phenylaminosulfonyl)phenylazo]-2-amino-8-hydroxy-6-naphthalenesulfonic acid sodium salt

6-Amino-4-hydroxy-5-[[4-(phenylaminosulfonyl)phenyl]azo]naphthalene-2-sulfonic acid sodium salt