64153-65-7 O-Ethyl O-isopropyl O-(5-methoxy-2-methyl-3-oxo-2H-pyridazin-4-yl) phosphorothioate Phosphorothioic acid, O-(2,3-dihydro-5-methoxy-2-methyl-3-oxo-4-pyridazinyl) O-ethyl O-(1-methylethyl) ester