[{"from": "human", "value": "What can you tell me about this molecule? [C][=C][N][Branch1][N][C][=Branch1][Ring2][=N][Ring1][Branch1][N+1][=Branch1][C][=O][O-1][C][C][Branch1][Ring1][C][18F][O]"}, {"from": "gpt", "value": "The molecule is a radiofluorinated 2-nitroimidazole derivate with hypoxia-specific tracer activity. Misonidazole is reduced under hypoxic conditions and in reduced form covalently binds to macromolecules in hypoxic cells. 18F (fluorine-18) radiofluorination of misonidazole to form 18F-fluoromisonidazole allows radioisotopic imaging of reduced misonidazole bound to macromolecules in hypoxic cells."}]