Lewisite
Encyclopedia article; The Columbia Encyclopedia, Sixth Edition, 2009
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...of lewisite, which penetrates ordinary clothing and even rubber, through the skin may be fatal. Chemically, lewisite is dichloro-2-chlorovinyl arsine, ClCHCHAsCl 2 . It boils with decomposition at 190 degrees Celsius, and its vapor has a faint odor...