3,4-(Methylenedioxy)mandelic Acid (CAS 27738-46-1) has a molecular formula of C?H?O? and molecular weight of 196.16 g/mol, with a methylenedioxy group (-O-CH?-O-) at C3/C4 and a carboxylic acid (-COOH) adjacent to a hydroxyl (-OH) on the benzene ring. As an aromatic ??-hydroxy acid intermediate, it is used in synthesizing pharmaceuticals and fine chemicals. It should be stored sealed in a cool, dry place to avoid moisture-induced degradation, ensuring stability for synthetic processes.