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Structures of the original cyclopentapeptide CXCR4 antagonist FC131 (A), novel analogue with ornithine substitution and polyethylene glycol (PEG)-thiol linker (B) and synthesis of CXCR4 targeted fluorescent probe NalGYOrn(PEG4SH)R-TxR; (DMF/Phosphate buffer (pH 7), room temperature, 21 h) followed by semi-preparative HPLC purification (C).
