Diphenylcyanoarsine, also called CLARK 2 (Cyanide

Cyanide

A cyanide is a chemical compound that contains the cyano group, -C≡N, which consists of a carbon atom triple-bonded to a nitrogen atom. Cyanides most commonly refer to salts of the anion CN−. Most cyanides are highly toxic....

-Arsenic

Arsenic

Arsenic is a chemical element with the symbol As, atomic number 33 and relative atomic mass 74.92. Arsenic occurs in many minerals, usually in conjunction with sulfur and metals, and also as a pure elemental crystal. It was first documented by Albertus Magnus in 1250.Arsenic is a metalloid...

 Kampfstoff) by the Germans, was discovered in 1918 by Sturniolo and Bellinzoni and shortly thereafter used like the related Clark 1

Diphenylchlorarsine

Diphenylchloroarsine is the organoarsenic compound with the formula 2AsCl. This odorless, toxic liquid was once used as harassing agent. It is also an intermediate in the preparation of other organoarsenic compounds...

 gas by the Germans for chemical warfare in the First World War. The substance forms colourless, garlic-smelling crystals and causes nausea, vomiting and headaches. It can subsequently lead to e.g. pulmonary oedema (fluid on the lungs).

See also

• Clark 1
  Diphenylchlorarsine
  Diphenylchloroarsine is the organoarsenic compound with the formula 2AsCl. This odorless, toxic liquid was once used as harassing agent. It is also an intermediate in the preparation of other organoarsenic compounds...
  
  
• Clark 3
• Chemical weapons