2-(4′-Chlorobenzoyl)benzoic acid

It serves as a precursor to 2-(3′-chlorosulphonyl-4′-chlorophenyl)phthalimidine, which is further processed into Chlorthalidone. It is also used to prepare phthalazinone-containing polymers and in various organic syntheses. 2-(4′-Chlorobenzoyl)benzoic acid is a key intermediate employed to synthesize the diuretic API Chlorthalidone.