4430-25-5 Benzenesulfonic acid, 2-[bis(3,5-dibromo-4-hydroxyphenyl)hydroxymethyl]-3,4,5,6-tetrabromo- NSC11236 Tetrabromophenol blue Tetrabromphenol tetrabromsulfonphthalein o-Toluenesulfonic acid, 3,4,5,6-tetrabromo-.alpha.,.alpha.-bis(3,5-dibromo-4-hydroxyphenyl)-.alpha.-hydroxy-