[{"from": "human", "value": "Create a molecule that satisfies the conditions outlined in the description. The molecule is a chemical compound of uranium. It is used as a negative stain in electron microscopy and in nuclear reprocessing. Uranium is a chemical element that has the symbol U and atomic number 92. It is a normal part of rocks, soil, air, and water, and occurs in nature in the form of minerals. Nitrite is a toxic compound known to cause methemoglobinemia. (L1137,  L248, L249, L257)"}, {"from": "gpt", "value": "[N+1][=Branch1][C][=O][Branch1][C][O][O-1].[N+1][=Branch1][C][=O][Branch1][C][O][O-1].[O][=U][=O]"}]