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2-Fluoro-5-(4-t-butylphenyl)benzoic acid 4'-(1,1-Dimethylethyl)-4-fluoro[1,1'-biphenyl]-3-carboxylic acid 4'-(1,1-Dimethylethyl)-4-fluoro[1,1'-biphenyl]-3-carboxylic acid [1,1'-Biphenyl]-3-carboxylic acid, 4'-(1,1-dimethylethyl)-4-fluoro-