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(A) Chemical formula and systematic numbering of the β-turn mimic Hot═Tap, the structurally related dipeptide motif Thr-Pro and the bicyclic dipeptide BTD (5). Constrained oligocyclic dipeptides, which fit the backbone register of oligopeptides, are named by a six-letter code (Xaa═Yaa) (12). (B) Chemical synthesis of the protected dipeptide Hot═Tap derivative 5 for solid-phase peptide synthesis.
