76-61-9 NSC11238 Phenol, 4,4'-(3H-2,1-benzoxathiol-3-ylidene)bis[5-methyl-2-(1-methylethyl)-, S,S-dioxide Thymol Blue Thymol, 6,6'-(3H-2,1-benzoxathiol-3-ylidene)di-, S,S-dioxide Thymolsulfonephthalein Thymolsulfophthalein Thymolsulphonphthalein Thymosulfonphthalein