1,4-Dimethyl-5-hydroxybenzenesulfonphthalein 125-31-5 2,5-Xylenol, 4,4'-(3H-2,1-benzoxathiol-3-ylidene)di-, S,S-dioxide (8CI) 4,4'-(3H-2,1-Benzoxathiol-3-ylidene)bis(2,5-dimethylphenol) S,S-dioxide EINECS 204-736-5 NSC 10471 Phenol, 4,4'-(1,1-dioxido-3H-2,1-benzoxathiol-3-ylidene)bis(2,5-dimethyl- Phenol, 4,4'-(3H-2,1-benzoxathiol-3-ylidene)bis(2,5-dimethyl-, S,S-dioxide Xylenol Blue p-Xylenesulfonephthalein p-Xylenol Blue p-Xylenolsulfonephthalein p-Xylenolsulfonphthalein p-Xylenolsulfophthalein