Synonyms: Benzoicacid, 2-[[7-[(2-arsonophenyl)azo]-1,8-dihydroxy-3,6-disulfo-2-naphthalenyl]azo]-,disodium salt (9CI); Benzoic acid,o-[[7-[(o-arsonophenyl)azo]-1,8-dihydroxy-3,6-disulfo-2-naphthyl]azo]-,S,S-disodium salt (7CI); Benzoic acid, o-[[7-[(o-arsonophenyl)azo]-1,8-dihydroxy-3,6-disulfo-2-naphthyl]azo]-,disodium salt (8CI)