Phenolphthalein,4,5,6,7-tetrachloro- (7CI); 3,4,5,6-Tetrachloro-a-(p-hydroxyphenyl)-a-(4-oxo-2,5-cyclohexadienylidene)-o-toluic acid;4,5,6,7-Tetrachloro-3,3-bis(4-hydroxyphenyl)phthalide; Phenoltetrachlorophthalein
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