73115-70-5 O-Isopropyl O,O-bis(5-methoxy-1-methyl-6-oxo-1H-pyridazin-4-yl) phosphorothioate Phosphorothioic acid, O,O-bis(1,6-dihydro-5-methoxy-1-methyl-6-oxo-4-pyridazinyl) O-(1-methylethyl) ester