2303-01-7 2877-89-6 3-Cresol purple 67763-22-8 88492-48-2 Cresol purple EINECS 218-960-6 NSC 9607 Phenol, 4,4'-(1,1-dioxido-3H-2,1-benzoxathiol-3-ylidene)bis(3-methyl- Phenol, 4,4'-(3H-2,1-benzoxathiol-3-ylidene)bis(3-methyl-, S,S-dioxide (9CI) m-Cresol purple m-Cresol, 4,4'-(3H-2,1-benzoxathiol-3-ylidene)di-, S,S-dioxide (8CI) m-Cresolsulfonephthalein