O-Ethyl methylphosphonothioic acid (EMPTA) is an organophosphate compound. A dual-use chemical, it has constructive uses in the synthesis of pesticides and pharmaceuticals, and it is also a precursor in the synthesis of nerve agents such as Agent VM and Agent VX. The detection of EMPTA is cited as a major influence in the United States' 1998 decision to destroy the Al-Shifa pharmaceutical factory in Sudan.

CAS：18005-40-8
中文别名：
英文别名：EMPSH;Methylthiophosphonic acid,o-ethyl ester;Methyl-thiophosphonsaeure-O-aethylester;methyl-phosphonothioic acid O-ethyl ester;Methyl-thiophosphonsaeure-O-ethylester;O-ethylmethylthiophosphonic acid;O-Ethyl methylphosphonothioic acid;EMPTA;EMPSH EMPTA;
分子式：C3H9O2PS
分子量：140.141
精确质量：140.006
Psa：71.36
Logp：1.6051

PubChem号：24868158
MDL号：MFCD00274635

密度：1.229g/cm3
沸点：190.6ºC at 760mmHg
闪点：69.1ºC
折射率：n20/D 1.487(lit.)
蒸汽压：0.145mmHg at 25°C

安全说明：S26; S36/37/39; S45
危险类别码：R23/24/25; R34
海关编码：2930909027
危险品运输编码：UN 2927 6.1/PG 2
危险品标志：T