[{"from": "human", "value": "Design a molecule that meets the criteria outlined in the description. 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."}, {"from": "gpt", "value": "[O][=Th][=O]"}]