[{"from": "human", "value": "Describe this molecule. [C][=C][C][=C][Branch1][Branch1][C][=C][Ring1][=Branch1][As][Branch1][=Branch2][C][=C][C][=C][C][=C][Ring1][=Branch1][Cl]"}, {"from": "gpt", "value": "The molecule appears as a colorless crystalline solid, or a dark-brown liquid. Strongly irritating to skin and eyes. Toxic by ingestion and inhalation. Used as a military poison gas."}]