[{"from": "human", "value": "Create a molecule that satisfies the conditions outlined in the description. The molecule is a monohaloethene that is ethene in which one of the hydrogens has been replaced by a chloro group. It has a role as a carcinogenic agent. It is a member of chloroethenes, a monohaloethene and a gas molecular entity."}, {"from": "gpt", "value": "[C][=C][Cl]"}]