[{"from": "human", "value": "Provide a brief overview of this molecule. [C][=C][N][Branch1][N][C][=Branch1][Ring2][=N][Ring1][Branch1][N+1][=Branch1][C][=O][O-1][C@@H1][C@H1][Branch1][=N][C@@H1][Branch1][=Branch2][C@H1][Branch1][Ring2][O][Ring1][Branch1][C][18F][O][O]"}, {"from": "gpt", "value": "The molecule is a radiofluorinated 2-nitroimidazole derivative with positron-emitting radioisotope activity. Upon administration, fluorine F 18-fluoroazomycin arabinoside is reduced under hypoxic conditions in the tumor microenvironment to a reactive species that covalently binds to intracellular macromolecules, providing a quantitative measure of viable hypoxic tissue when imaged with positron emission tomography. Compared to 18F-misonidazole, fluorine F 18-fluoroazomycin arabinoside has a lower octanol:water partition coefficient; it therefore has less tendency to accumulate in lipophilic tissues and exhibits a faster renal clearance, which may result in improved imaging of hypoxic tissue."}]