[{"from": "human", "value": "Design a molecule that meets the criteria outlined in the description. The molecule is a nitroso compound that is hydrogen sulfide in which one of the hydrogens is replaced by a nitroso group. It has a role as a signalling molecule. It is a nitroso compound, a hydracid and an inorganic molecular entity."}, {"from": "gpt", "value": "[N][=Branch1][C][=O][S]"}]