3(2H)-Pyridazinone, 6-hydroxy-, O-ester with O,O-dimethyl phosphorothioate 4-25-00-00027 (Beilstein Handbook Reference) 5836-40-8 American cyanamid 12,433 BRN 0018225 ENT 23,967 O,O-Dimethyl O-(2,3-dihydro-3-oxo-6-pyridazinyl)phosphorothioate O,O-Dimethyl O-(6-3(2H)-pyridazinonyl) phosphorothioate O,O-Dimethylphosphorothioate, O-ester with 6-hydroxy-3(2H)-pyridazinone O-(1,6-Dihydro-6-oxopyridazin-3-yl) O,O-dimethyl phosphorothioate Phosphorothioic acid, O,O-dimethyl ester, O-ester with 6-hydroxy-3-(2H)-pyridazinone