<unk>  (L) is an organoarsenic compound. It was once manufactured in the U.S., Japan, Germany and the Soviet Union for use as a chemical weapon, acting as a vesicant (blister agent) and lung irritant. Although the substance is colorless and odorless in its pure form, impure samples of<unk>  are a yellow, brown, violet-black, green, or amber oily liquid with a distinctive odor that has been described as similar to geraniums.
Lewisite
Metaldehyde
Lewis lead
Vinyl chloride
Cyanide
Bromide
Alkylphenol
Methanol