Synonyms: Phenol,4,4'-(3H-2,1-benzoxathiol-3-ylidene)bis[3-methyl-, S,S-dioxide;m-Cresol purple(6CI);m-Cresol, 4,4'-(3H-2,1-benzoxathiol-3-ylidene)di-, S,S-dioxide (8CI);o-Toluenesulfonic acid, a-hydroxy-a,a-bis(4-hydroxy-o-tolyl)-, g-sultone (7CI);Cresol purple;Metacresol Purple;NSC9607;m-Cresolsulfonephthalein;