4915-25-7 ENT 27,331 HRS 1879 Hooker hrs-1879 NSC 190931 Phosphorothioic acid, S-(4-chlorotetrahydro-3-thienyl) O,O-diethyl ester, 1,1-dioxide S-(4-Chlorotetrahydro-3-thienyl) O,O-diethyl phosphorothioate 1,1-dioxide