1733-12-6 62625-29-0 EINECS 263-654-8 Phenol, 4,4'-(1,1-dioxido-3H-2,1-benzoxathiol-3-ylidene)bis(2-methyl-, monosodium salt Sodium cresol red Sodium hydrogen 4,4'-(3H-2,1-benzoxathiol-3-ylidene)bis(2-methylphenolate) S,S-dioxide