Oligooxopiperazines as Topographical Helix Mimetics.- Heterocyclic Extended Peptide Surrogates for β-Strand Stabilization.- Diketopiperazine based peptide mimic scaffolds.- Synthesis of Constrained Peptidomimetics via the Pictet-Spengler Reaction.- Peptidomimetics via Iminium Ion Chemistry on Solid Phase: Single, Fused, and Bridged Heterocycles.- Synthesis of peptidomimetics through the disrupted Ugi reaction with aziridine aldehyde dimers.- Some Recent Studies on Gramicidin S Analogs, Their Structures and Antimicrobial Activities.- Anti-amyloidogenic Heterocyclic Peptides.- Lipoylated peptides and proteins.