1-Propyl-6-methyl-4-(diethylthiophosphoryl)-2-pyridone 21327-31-1 AI3-27631 MC 3118 Phosphorothioic acid, O,O-diethyl ester, O-ester with 4-hydroxy-6-methyl-1-propyl-2(1H)-pyridone Phosphorothioic acid, O-(1,2-dihydro-6-methyl-2-oxo-1-propyl-4-pyridinyl) O,O-diethyl ester