[{"from": "human", "value": "Describe this molecule. [C][As][Branch1][C][Cl][Cl]"}, {"from": "gpt", "value": "The molecule is a organoarsenic compound which belongs to the group of chemical warfare agents known as blister agents or vesicants. Due to its toxicity, it is nowadays considered obsolete. Arsenic is a chemical element that has the symbol As and atomic number 33. It is a poisonous metalloid that has many allotropic forms: yellow (molecular non-metallic) and several black and grey forms (metalloids) are a few that are seen. Three metalloidal forms of arsenic with different crystal structures are found free in nature (the minerals arsenopyrite and the much rarer arsenolamprite and pararsenolamprite), but it is more commonly found as a compound with other elements.  (T3, L366)"}]