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General structure of macrocyclic peptides containing multiple N-alkylated structures designed and synthesized in this study. From C-terminus to N-teminus, it has peptide (Glu), N-alkylated alanine, N-alkylated glycine, peptide, N-alkylated alanine, and N-alkylated glycine units. Each residue, other than the C-terminal Glu, was numbered with 1–5 from C-teminus to N-terminus. Peptide, N-alkylated glycine, N-alkylated alanine units are colored in black, blue, and red, respectively.
