4935-28-8 ENT 27,144 MRC 441 NIA-9227 Niagara 9227 O,O-Diethyl O-(2-oxo-2H-1-benzopyran-3-yl)phosphorothioate O,O-Diethyl phosphorothioate O-ester with 3-hydroxycoumarin Phosphorothioic acid, O,O-diethyl O-(2-oxo-2H-1-benzopyran-3-yl) ester Phosphorothioic acid, O,O-diethyl ester, O-ester with 3-hydroxycumarin