3,4,5,6-Tetrachloro-alpha-(p-hydroxyphenyl)-alpha-(4-oxo-2,5-cyclohexadienylidene)-o-toluic acid;benzoic acid, 2,3,4,5-tetrachloro-6-[(4-hydroxyphenyl)(4-oxo-2,5-cyclohexadien-1-ylidene)methyl]-
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