CN gas
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CN, or chloracetophenon, is a gas used as a riot control agent. It has the molecular form C₈H₁₃ClO. It was investigated, but not used, during the First and Second World Wars, and was used by United States forces in Vietnam. As its toxicity is apparently greater than that of CS gas, it has largely been supplanted by the latter agent.

The original article can be found at: http://en.wikipedia.org/wiki/CN_gas.
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