ルイサイト

Also known as L, (2-chlorovinyl)dichloro-arsine, dichloro(2-chlorovinyl)-arsine, (2-chloroethenyl)-arsenous dichloride, (2-chloroethenyl)-arsonous dichloride, (2-chloroethenyl)arsonous dichloride, (2-chlorovinyl) dichloroarsine, (e)-lewisite 1

Lewisite (L) (A-243) is an organoarsenic compound. It was once manufactured in the United States, Japan, Germany and the Soviet Union for use as a chemical weapon, acting as a vesicant (blister agent) and lung irritant. Although colorless and odorless in its pure form, impure samples of lewisite are a yellow, brown, violet-black, green, or amber oily liquid with a distinctive odor that has been described as similar to geraniums.