18786-32-8 19942-72-4 CROTONIC ACID, 3-HYDROXY-, METHYL ESTER, O-ESTER with O,O-DIMETHYLPHOSPHOROTHIOA Crotonic acid, 3-hydroxy-, methyl ester, O-ester with O,O-dimethylphosphorothioate, (Z)- cis-3-Hydroxycrotonic acid methyl ester O,O-dimethyl phosphorothioate trans-Thiono-phosdrin