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Chemical structures of prosthetic groups for radioiodination and fluorination of peptides: (a) 4-[I]iodobenzaldehyde; (b) N-[2-(2,5-Dioxo-2,5-dihydro-pyrrol-1-yl)-ethyl]-3-[I]iodo-benzamide; (c) 4-[F]fluorobenzaldehyde; (d) [F]fluoroethylazide.
