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A novel histidine derivative containing 4-nitroimidazole,(S)-2-(4-((4-nitro-1H-imidazol-1-yl) methyl) benzamido)-3-(1H-imidazol-4-yl)propanoic acid (His-NI),was synthesized and labeled with [99mTc(CO)3(H2O)3]+.The tricarbonyl technetium complex,the 99mTc(