Soman, also known by its NATO designation GD (O-Pinacolyl methylphosphonofluoridate) is an extremely toxic substance whose sole application is as one of the world's most dangerous military weapons. It is a nerve agent, interfering with normal functioning of the mammalian nervous system by inhibiting the cholinesterase enzyme. As a chemical weapon, it is classified as a weapon of mass destruction by the United Nations according to UN Resolution 687, and its production is strictly controlled and stockpiling outlawed by the Chemical Weapons Convention of 1993. Soman was the third of the so-called G-series nerve agents to be discovered (along with GA (tabun), GB (sarin), and GF (cyclosarin)). It is a volatile, corrosive and colourless liquid with a faint odour when pure. More commonly, it is a yellow to brown color and has a stronger odour described as camphor. The LCt50 for Soman is 70 mg·m

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