EMPTAO-Ethyl Methylphosphonothioic Acid (VX Nerve Gas precursor)
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The Los Angeles Times cited experts who said not only that EMPTA has multiple uses but that apparent traces could have come from a number of other sources.
The sample showed traces of a substance called EMPTA, or O-ethylmethylphosphonothioic acid, a material with no commercial uses that is a key ingredient of VX.
The production of EMPTA took up a small space within the sprawling Shifa plant, according to the US, and evidence of the production effort may be difficult for international inspectors to find, the intelligence official said.