[{"from": "human", "value": "Create a molecule with the structure as the one described. The molecule is an inorganic sodium salt composed from sodium cations and arsenate dianions in a 2:1 ratio. It has a role as a poison. It contains an arsenate(2-)."}, {"from": "gpt", "value": "[O][As][=Branch1][C][=O][Branch1][C][O-1][O-1].[Na+1].[Na+1]"}]