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Chemical structures of the norepinephrine and its radiolabeled analogues. ([11C]-EPI:[11C]-Epinephrine, [123I]-MIBG: [123I]-metaiodobenzylguanidine, [18F]-LMI1195: N-[3-bromo-4-(3-[18F]fluoro-propoxy)-benzyl]-guanidine, [11C]-mHED: [11C]-meta-hydroxyephedrine, [11C]-PHEN: [11C]-phenylephrine, [18F]-4F-MHPG: 4-[18F]-fluoro-3-hydroxy-phenelthylguadinine, [18F]-3F-PHPG: 3-[18F]-fluoro-4-hydroxy-phenelthylguadinine).
