[{"from": "human", "value": "Design a molecule that meets the criteria outlined in the description. The molecule is a nitrate of mangesium. It is found in mines and caverns as nitromagnesite and can be used in ceramics, printing, chemical and agriculture (as a fertilizer) industries. Nitrite is a toxic compound known to cause methemoglobinemia. (L1137,  L1631)"}, {"from": "gpt", "value": "[N+1][=Branch1][C][=O][Branch1][C][O-1][O-1].[N+1][=Branch1][C][=O][Branch1][C][O-1][O-1].[Mg+2]"}]