1(3H)-Isobenzofuranone, 3,3-bis(4-hydroxyphenyl)-4,5,6,7-tetrachloro- 3,4,5,6-Tetrachloro-alpha-(p-hydroxyphenyl)-alpha-(4-oxo-2,5-cyclohexadienylidene)-o-toluic acid 4,5,6,7-Tetrachloro-3,3-bis(4-hydroxyphenyl)phthalide 4,5,6,7-Tetrachlorophenolphthalein 639-44-1 EINECS 211-354-2 Phenoltetrachlorophthalein