2511-10-6 4-04-00-03515 (Beilstein Handbook Reference) BRN 1753418 LG 61 Methylphosphonothioic acid O,S-diethyl ester O,S-DIETHYL METHYLPHOSPHONOTHIOATE O,S-Diethyl methylthiophosphonate Phosphonothioic acid, methyl-, O,S-diethyl ester