Synonyms: Aniline,4,4'-(3H-2,1-benzoxathiol-3-ylidene)di-, S,S-dioxide (8CI); Benzenamine, 4,4'-(3H-2,1-benzoxathiol-3-ylidene)bis-,S,S-dioxide; o-Toluenesulfonic acid, a,a-bis(p-aminophenyl)-a-hydroxy-, g-sultone(7CI); 3H-2,1-Benzoxathiole, benzenamine deriv.; Anilinesulfonephthalein