[{"from": "human", "value": "What can you tell me about this molecule? [O-1][S][=Branch1][C][=O][=Branch1][C][=O][O-1].[O][=U+2][=O]"}, {"from": "gpt", "value": "The molecule is a chemical compound of uranium. It is used as a negative stain in electron microscopy. 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. (L248, L249, L258)"}]