Cacodyle

Cacodyle, or KAKODYLE, is an organic substance containing carbon, hydrogen, and arsenic, $((\backslash text\{CH\}\_3)\_2\backslash text\{As\})\_2$. The oxide of cacodyle, $((\backslash text\{CH\}\_3)\_2\backslash text\{As\})\_2\backslash text\{O\}$, otherwise known as Cadet's fuming liquor or alkarsine, has the remarkable property of taking fire spontaneously when exposed to the air, and evolving abundant and exceedingly poisonous fumes of arsenic.