1497-39-8 4-06-00-00868 (Beilstein Handbook Reference) AI3-25795 BRN 2273543 ENT 25,795 N 2599 O-(4-Chlorophenyl) O-ethyl ethylphosphonothioate Phosphonothioic acid, ethyl-, O-(4-chlorophenyl) O-ethyl ester Stauffer N-2599