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Lewisite

C2H2AsCl3; dichloro(2-chlorovinyl)arsine;a war gas. It is a vesicant, a lung irritant like mustard gas, a systemic poison entering the circulation through the lungs or skin, and a mitotic poison arresting mitosis in the metaphase; dimercaprol is the antidote.

Synonym: beta-chlorovinyldichloroarsine.

Origin: W. Lee lewis, U.S. Chemist 1898-1943