[{"from": "human", "value": "Design a molecule that meets the criteria outlined in the description. The molecule appears as pale yellow crystals or yellowish powder. Decomposes at 243-244 \u00b0C. Used for the treatment of rheumatoid arthritis. A known carcinogen."}, {"from": "gpt", "value": "[C][N][C][=N][C][=Branch2][Ring1][C][=C][Ring1][Branch1][S][C][=N][C][=N][C][=C][Ring1][=Branch1][N][C][=N][Ring1][Branch1][N+1][=Branch1][C][=O][O-1]"}]