has role VX nerve agent A organic thiophosphate that is the ethyl ester of <i>S</i>-{2-[di(propan-2-yl)amino]ethyl} <em>O</em> hydrogen methylphosphonothioate. A toxic nerve agent used in chemical warfare. CHEBI:136185 organic thiophosphate EC 3.1.1.7 (acetylcholinesterase) inhibitor neurotoxin tertiary amino compound