[{"from": "human", "value": "Create a molecule that satisfies the conditions outlined in the description. The molecule is a one-carbon compound that is arsonous acid in which the hydrogen attached to arsenic is replaced by a methyl group. It has a role as a carcinogenic agent, a poison and a human xenobiotic metabolite. It is a member of arsonous acids and a one-carbon compound. It is functionally related to an arsonous acid. It is a conjugate acid of a methylarsonite."}, {"from": "gpt", "value": "[C][As][Branch1][C][O][O]"}]