[{"from": "human", "value": "Generate a molecule based on this description. The molecule is a purine derivative with antineoplastic and anti-angiogenic properties.  6-methylmercaptopurine riboside (6-MMPR) inhibits amidophosphoribosyltransferase, the first committed step in de novo purine synthesis, and inhibits fibroblast growth factor-2 (FGF2)-induced cell proliferation. (NCI04)"}, {"from": "gpt", "value": "[C][S][C][=N][C][=N][C][=C][Ring1][=Branch1][N][=C][N][Ring1][Branch1][C@H1][C@@H1][Branch1][=N][C@@H1][Branch1][=Branch2][C@H1][Branch1][Ring2][O][Ring1][Branch1][C][O][O][O]"}]