[{"from": "human", "value": "Generate a molecule based on this description. The molecule is a tetrathionate ion. It is a conjugate base of a tetrathionic acid. It is a conjugate acid of a tetrathionate(2-)."}, {"from": "gpt", "value": "[O][S][=Branch1][C][=O][=Branch1][C][=O][S][S][S][=Branch1][C][=O][=Branch1][C][=O][O-1]"}]