4-(Chlorocarbonyl)benzoic Acid Methyl Ester, is a building block, that can be used for the synthesis of various pharmaceutical compounds. It can be used for the preparation of benzophenone residues and also for the synthesis of novel novel bulky hydrophobic retinoids. 4-(Chlorocarbonyl)benzoic Acid Methyl Ester, is a building block, that can be used for the synthesis of various pharmaceutical compounds. It can be used for the preparation of benzophenone residues and also for the synthesis of novel novel bulky hydrophobic retinoids.