[{"from": "human", "value": "Provide a description of this molecule. [O][=Th][=O]"}, {"from": "gpt", "value": "The molecule is a radioactive crystalline solid compound used in a broad range of industrial applications. Thorium dioxide was utilized as a radiographic contrast agent; however, it is no longer considered safe for use in human patients because it was found to be a carcinogen that can cause cholangiocarcinoma."}]