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Chemical structures of two derivatives of a guanine PNA monomer involved in G4 formation: (i) the guanine PNA monomer covalently linked at the N-terminus of the RHAU23 peptide (4) [97] and (ii) the N-Fmoc-protected guanine PNA monomer amidated at the carboxylic function with a 5-aminopentanoic acid (5) [98].
