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Chemical and ball-and-stick structures of polyamides 1-6 and their Chl conjugates. (Left) α-diaminobutyric acid-linked hairpin polyamides. (Right) γ-diaminobutyric acid-linked hairpin polyamides. The ball and stick symbols are defined as follows: an open circle denotes a pyrrole ring, a filled circle denotes an imidazole, and a diamond shape denotes β-alanine.
