[{"from": "human", "value": "Generate a molecule based on this description. The molecule is under investigation in clinical trial NCT02370563 (PET Imaging of Intracranial Cancers With 18F-FSPG)."}, {"from": "gpt", "value": "[C][Branch2][Ring1][Ring2][C][C@@H1][Branch1][O][C][C@@H1][Branch1][=Branch1][C][=Branch1][C][=O][O][N][C][=Branch1][C][=O][O][C][18F]"}]