[{"from": "human", "value": "Based on the given information, design a molecule that meets the desired specifications. The molecule is a sulfur oxoacid that consists of two oxo and two hydroxy groups joined covalently to a central sulfur atom. It has a role as a catalyst. It is a conjugate acid of a hydrogensulfate."}, {"from": "gpt", "value": "[O][S][=Branch1][C][=O][=Branch1][C][=O][O]"}]