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|Section2= |Section3= }} Cyclosarin or GF (cyclohexyl methylphosphonofluoridate) is an extremely toxic substance used as a chemical weapon. It is a member of the ''G-series'' family of nerve agents, a group of chemical weapons discovered and synthesized by a German team led by Dr. Gerhard Schrader. The major nerve gases are the G agents, sarin (GB), soman (GD), tabun (GA), and the V agents such as VX. The original agent, tabun, was discovered in Germany in 1936 in the process of work on organophosphorus insecticides. Next came sarin, soman and finally the most toxic, cyclosarin, a product of commercial insecticide laboratories prior to World War II. As a chemical weapon, it is classified as a weapon of mass destruction by the United Nations. Pursuant to UN Resolution 687 its production and stockpiling was outlawed globally by the Chemical Weapons Convention (CWC) of 1993, although Egypt, Israel, North Korea and South Sudan have not ratified the CWC (thus not outlawing their own stockpiling of chemical weapons). ==Chemical characteristics== Like its predecessor sarin, cyclosarin is a liquid organophosphate nerve agent. Its physical characteristics are, however, quite different from sarin. At room temperature, cyclosarin is a colorless liquid whose odor has been variously described as sweet and musty, or resembling peaches or shellac. Unlike sarin, cyclosarin is a ''persistent'' liquid, meaning that it has a low vapor pressure and therefore evaporates relatively slowly, about 69 times slower than sarin and 20 times slower than water. Also unlike sarin, cyclosarin is flammable, with a flash point of 94 °C (201 °F). Cyclosarin (GF) also demonstrates greater toxicity than sarin (GB) in humans. Sarin has a median lethal dose (LD50) of 5 mg (for a 70 kg human), while GF has an LD50 of 1.2 mg. The median lethal concentration and time (LCt50) of cyclosarin is 50 mg⋅min/m3, which is half that of GB. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Cyclosarin」の詳細全文を読む スポンサード リンク
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