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Chemical structures of hypoxia specific PET tracers. 18F-FMISO: 18F-fluoromisonidazole; 18F-FETNIM: 18F-fluoroerythronitroimidazole; 18F-FAZA: 18F-fluoroazomycin; 64Cu-ATSM: 64Cu(II)diacethyl-bis(N4-methylthiosemicarbazone). Besides 64Cu, Cu-ATSM can also be labeled with other radioactive copper isotopes such as 60Cu, 61Cu and 62Cu.
