13955-12-9 BAY 52553 BRN 2221216 Bayer 52553 ENT 27,248 L-9/125 O-Methyl O-(1-methylethyl) O-(4-nitrophenyl) phosphorothioate Phosphorothioic acid, O-isopropyl O-methyl O-(p-nitrophenyl) ester Phosphorothioic acid, O-methyl O-(1-methylethyl) O-(4-nitrophenyl) ester