2-(4-chloro-3-sulfamoylbenzoyl)benzoic acid; Benzoic Acid, 2-(4-Chloro-3-sulphamoylbenzoyl); 2-[3-(Aminosulfonyl)-4-chlorobenzoyl]-benzonic Acid;o-(4-Chloro-3-sulfamoylbenzoyl)-benzoic Acid; Chlorthalidone Acid; 4'-Chloro-3'-sulfamoyl-2-benzophenone Carboxylic Acid; Chlorthalidone Related Compound A (USP)