62052-59-9 Bis(1-methylethyl) (4-(benzoyloxy)-1,3-dithiolan-2-ylidene)propanedioate Diisopropyl 4-benzyloxy-1,3-dithiolan-2-ylidene malonate Propanedioic acid, (4-(benzoyloxy)-1,3-dithiolan-2-ylidene)-, bis(1-methylethyl) ester