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The compound 2-chlorobenzalmalononitrile (also called o-chlorobenzylidene malononitrile) (chemical formula: C10H5ClN2), a cyanocarbon, is the defining component of "tear gas".
Use of CS teat gas in war is prohibited under the terms of the 1997 Chemical Weapons Convention, signed by most nations in 1993.
this is the point of the op. it's ok for usa to use cs gas on its own children, but not ok for syria to use a chemical weapon on its children.
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