1,2-Benzenediol, 4,4'-(1,1-dioxido-3H-2,1-benzoxathiol-3-ylidene)bis- 1,2-Benzenediol, 4,4'-(3H-2,1-benzoxathiol-3-ylidene)bis-, S,S-dioxide (9CI) 115-41-3 3117-41-7 3H-2,1-Benzoxathiole, 3,3-bis(3,4-dihydroxyphenyl)-, 1,1-dioxide 51433-99-9 68943-33-9 AI3-63038 Catechol violet EINECS 204-088-3 NSC 622476 NSC 8805 PKF Pyrocatechinsulfonephthalein Pyrocatechol violet Pyrocatechol, 4,4'-(3H-2,1-benzoxathiol-3-ylidene)di-, S,S-dioxide (8CI)