[{"from": "human", "value": "Provide a brief overview of this molecule. [C][As][Branch1][C][O-1][O-1]"}, {"from": "gpt", "value": "The molecule is an arsenic oxoanion obtained deprotonation of both arsenite OH groups of methylarsonous acid. It is functionally related to an arsonite(2-). It is a conjugate base of a methylarsonous acid."}]