[{"from": "human", "value": "Based on the given information, design a molecule that meets the desired specifications. The molecule is an arsenate ion resulting from the removal of one proton from arsenic acid. It is a conjugate base of an arsenic acid. It is a conjugate acid of an arsenate(2-)."}, {"from": "gpt", "value": "[O][As][=Branch1][C][=O][Branch1][C][O][O-1]"}]