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Chemical structures of c(RGDfK)]2 analogues with PEG4 spacers; [18F]FP-PEG4-E[c(RGDfK)]2 11, [68Ga]Ga-NOTA-PEG4-E[c(RGDfK)]2 12, [18F]AlF-NOTA-PEG4-c(RGDfK)]2 13, [18F]AlF-NOTA-E[PEG4-c(RGDfK)]2 or [18F]Alfatide II 14, [68Ga]Ga-NOTA-E[PEG4-c(RGDfK)]2 15, [18F]FP-PEG4-E[PEG4-c(RGDfK)]2, 16 (HN-PEG4-COOH = 15-amino-4,7,10,13-tetraoxapentadecanoic acid).
