[{"from": "human", "value": "Provide a description of this molecule. [C][=C][C][=C][C][=Branch1][Ring2][=C][Ring1][=Branch1][C][=N][C][=C][C][=C][C][=C][Ring1][=Branch1][O][Ring1][N]"}, {"from": "gpt", "value": "The molecule is an incapacitating agent and a lachrymatory agent. It was developed by the British Ministry of Defence as a riot control agent in the late 1950s and early 1960s. Dibenz(b,F)-1,4-oxazepine is a lachrymatory agent (LA), exerting its effects through activation of the TRPA1 channel. It is a suspected carcinogen. It is toxic, but less so than CS gas (2-chlorobenzalmalononitrile), by ingestion and exposure. However, it can be lethal in large quantities. In a poorly ventilated space, an individual may inhale a lethal dose within minutes. Death is caused by asphyxiation and pulmonary edema. The effect of CR is long-term and persistent. CR can persist on surfaces, especially porous ones, for up to 60 days."}]