United Kingdom chemical weapons programme

Sarin (NATO designation GB short for G-series, B) is an extremely toxic organophosphorus compound that has been often used as a chemical weapon due to its extreme potency as a nerve agent.

chemical compound and chemical warfare nerve agent

Adamsite or DM is an organic compound; technically, an arsenical diphenylaminechlorarsine, that can be used as a riot control agent. DM belongs to the group of chemical warfare agents known as vomiting agents or sneeze gases. First synthesized in Germany by Heinrich Otto Wieland in 1915, it was independently developed by the US chemist Roger Adams (for whom it is named) at the University of Illinois in 1918.

first large-scale use of chemical weapons leading to their banning

1910s 200 mm mortar of British origin