[{"from": "human", "value": "Create a molecule with the structure as the one described. The molecule is a cytotoxic purine antagonist that has both immunosuppressive and antiarthritic activity. (NCI)"}, {"from": "gpt", "value": "[C][N][C][=N][C][=Branch2][Ring1][Branch1][=C][Ring1][Branch1][S][C][=N][C][=Branch1][O][=N][C][=C][Ring1][=Branch1][N][C][=N][Ring1][Branch1][N][N+1][=Branch1][C][=O][O-1]"}]