1733-12-6 3',3''-Dimethylphenolsulfonephthalein 32210-84-7 62625-29-0 Cresol red Cresolsulfophthalein EINECS 217-064-2 NSC 7224 Phenol, 4,4'-(1,1-dioxido-3H-2,1-benzoxathiol-3-ylidene)bis(2-methyl- Phenol, 4,4'-(3H-2,1-benzoxathiol-3-ylidene)bis(2-methyl-, S,S-dioxide (9CI) o-Cresol Red o-Cresol, 4,4'-(3H-2,1-benzoxathiol-3-ylidene)di-, S,S-dioxide (8CI) o-Cresolsulfonephthalein