[{"from": "human", "value": "Describe this molecule. [N][=Branch1][C][=O][S]"}, {"from": "gpt", "value": "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."}]