O-Ethyl methylphosphonothioic acid

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O-Ethyl methylphosphonothioic acid
O-Ethyl methylphosphonothioic acid Structural Formula V.1.svg
IUPAC name
O-Ethyl hydrogen methylphosphonothioate
Other names
Methyl-phosphonothioic acid O-ethyl ester
CAS number 18005-40-8 YesY
ChemSpider 483881 YesY
Jmol-3D images Image
PubChem 556615
Molar mass 140.14 g·mol−1
Except where noted otherwise, data is given for materials in their standard state (at 25 °C (77 °F), 100 kPa)
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Infobox references

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.[1]


  1. ^ Claudine McCarthy (2005). "EMPTA (O-Ethyl methylphosphonothioic acid)". In Eric Croddy, James J. Wirtz. Weapons of mass destruction: an encyclopedia of worldwide policy, technology, and history (Google Books excerpt). pp. 123–124. ISBN 1-85109-490-3.