[{"from": "human", "value": "Generate a molecule based on the given description. The molecule is a chemical compound of potassium and nitrite ions. It is used as a food preservative and in the manufacturing of heat transfer salts. Nitrite is a toxic compound known to cause methemoglobinemia. (L1137, L1616)"}, {"from": "gpt", "value": "[N][=Branch1][C][=O][O-1].[K+1]"}]