2303-01-7 67763-22-8 EINECS 267-043-7 Phenol, 4,4'-(1,1-dioxido-3H-2,1-benzoxathiol-3-ylidene)bis(3-methyl-, monosodium salt Sodium hydrogen 4,4'-(3H-2,1-benzoxathiol-3-ylidene)bis(3-methylphenolate) S,S-dioxide Sodium m-cresol purple