2-Ethoxycarbonyl-1-methylvinyl cyclohexyl methylphosphonate

2-Ethoxycarbonyl-1-methylvinyl cyclohexyl methylphosphonate is an extremely toxic organophosphate nerve agent. It is the cyclohexyl methylphosphonate ester of ethyl acetoacetate. The compound has two isomers, the "cis" isomer and "trans" isomer, with the "trans" isomer being more toxic.