[{"from": "human", "value": "Synthesize a molecule that matches the given characteristics. The molecule is an inorganic sodium salt having hydrogensulfite as the counterion. It has a role as a mutagen and an allergen. It is an inorganic sodium salt and a sulfite salt. It contains a hydrogensulfite."}, {"from": "gpt", "value": "[O][S][=Branch1][C][=O][O-1].[Na+1]"}]