64153-66-8 BRN 0832289 Phosphorothioic acid, O-(1,6-dihydro-5-methoxy-1-methyl-6-oxo-4-pyridazinyl) S-ethyl O-(1-methylethyl) ester S-Ethyl O-isopropyl O-(5-methoxy-1-methyl-6-oxo-1H-pyridazin-4-yl) phosphorothioate