[{"from": "human", "value": "Based on the given information, design a molecule that meets the desired specifications. The molecule is a potassium salt composed of potassium and tetrathionate ions in a 2:1 ratio. It contains a tetrathionate(2-)."}, {"from": "gpt", "value": "[O-1][S][=Branch1][C][=O][=Branch1][C][=O][S][S][S][=Branch1][C][=O][=Branch1][C][=O][O-1].[K+1].[K+1]"}]