What is "diphenylchlorarsine"

Diphenylchloroarsine (DA) is the organoarsenic compound with the formula (CH)AsCl. It is a low-melting solid. It is highly toxic and was once used in chemical warfare. It is also an intermediate in the preparation of other organoarsenic compounds. The molecule consists of a pyramidal As(III) center attached to two phenyl rings and one chloride.