title: NMR studies of a free and protected tetrapeptide glycyl-L-prolylglycylglycine in beta-turn-supporting environment.
mesh_terms: D009682:Magnetic Resonance Spectroscopy / Q000379:methods; D008958:Models, Molecular; D009842:Oligopeptides / Q000138:chemical synthesis; D011487:Protein Conformation
chemical_list: D009842:Oligopeptides