2-Propyne-1-thiol, S-ester with O,O-diethyl phosphorothioate 3309-78-2 BRN 1909122 ENT 24,949 Ethyl 2-propynyl phosphorothioate Monsanto CP-11549 O,O-Diethyl S-(2-propynyl)phosphorothioate Phosphorothioic acid, O,O-diethyl S-2-propynyl ester