[{"from": "human", "value": "Describe this molecule. [N][=Branch1][C][=O][O-1].[Na+1]"}, {"from": "gpt", "value": "The molecule is a chemical compound of sodium and nitrite ions. It is used mainly as a color fixative and preservative in meats and fish. Sodium nitrite may also be used in organic synthesis, in dyeing and printing textile fabrics, in photography, as a laboratory reagent and a corrosion inhibitor, and in the manufacture of rubber chemicals. Sodium nitrite also has been used in human and veterinary medicine as a vasodilator, a bronchodilator, and an antidote for cyanide poisoning. Nitrite is a toxic compound known to cause methemoglobinemia. (L1137, L1617)"}]