[{"from": "human", "value": "Describe this molecule. [O][As][=Branch1][C][=O][Branch1][C][O-1][O-1]"}, {"from": "gpt", "value": "The molecule is an arsenate ion resulting from the removal of two protons from arsenic acid. It is a conjugate base of an arsenate(1-). It is a conjugate acid of an arsenate(3-)."}]