Similar names: Phosphorothioic acid, O,O-diethyl ester, O-ester with 6-hydroxy-2-phenyl-3(2H)-pyridazinone (7CI,8CI); 3(2H)-Pyridazinone, 6-hydroxy-2-phenyl-, O-ester with O,O-diethyl phosphorothioate (8CI); American Cyanamid 12,503; CL 12503; ENT 23,968; O,O-Diethyl O-(2,3-dihydro-3-oxo-2-phenyl-6-pyridazinyl) phosphorothioate; O,O-Diethyl phosphorothioate O-ester with 6-hydroxy-2-phenyl-3(2H)-pyridazinone; O-(1,6)-Dihydro-6-oxo-1-phenylpyridazin-3-yl) O,O-diethyl phosphorothioate; Ofunack; Oreste; Pyridafenthion; Pyridaphenthion; Phosphorothioic acid, O-(1,6-dihydro-6-oxo-1-phenyl-3-pyridazinyl) O,O-diethyl ester