This class of compounds is comprised of so-called coughing and sneezing agents.   These compounds were able to penetrate most gas mask filters. The concept behind these arsenic-based compounds was to induce coughing and sneezing symptoms to the point that the affected individual would be forced to remove their mask, making them vulnerable to other more deadly agents such as chlorine or phosgene.

  sternutators

    diphenylchlorarsine                      diphenylcyanoarsine