Diphenylcyanoarsine, also called Clark 2 (Chlor-Arsen-Kampfstoff 2, being the successor of Clark 1) by the Germans, was discovered in 1918 by Sturniolo and Bellinzoni and shortly thereafter used like the related Clark 1 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).

CAS：23525-22-6
中文别名：
英文别名：Arsinous cyanide,diphenyl;Diphenylarsencyanid;Diphenyl-arsincarbonitril;Diphenylarsine cyanide;Diphenylarsinous cyanide;Diphenylcyanoarsine;Diphenyl-cyanarsin;diphenyl-arsinecarbonitrile;Clark 2;
分子式：C13H10AsN
分子量：255.147
精确质量：255.003
Psa：23.79
Logp：1.35838

EINECS号：245-716-6

沸点：333.7ºC at 760mmHg
闪点：150.5ºC
蒸汽压：0.000134mmHg at 25°C

海关编码：2931900090