title: STUDIES ON POLYPEPTIDE ANTIBIOTICS. I. 2,5-DIKETOPIPERAZINES AS MODELS OF CYCLIC POLYPEPTIDE ANTIBIOTICS.
mesh_terms: D000900:Anti-Bacterial Agents; D002623:Chemistry Techniques, Analytical; D054659:Diketopiperazines; D008239:Lysine; D010447:Peptide Hydrolases; D010455:Peptides; D010649:Phenylalanine; D010879:Piperazines; D014633:Valine
chemical_list: D000900:Anti-Bacterial Agents; D054659:Diketopiperazines; D010455:Peptides; D010879:Piperazines; D010649:Phenylalanine; D010447:Peptide Hydrolases; D014633:Valine; D008239:Lysine
keywords: ANTIBIOTICS; CHEMISTRY, ANALYTICAL; LYSINE; PEPTIDE HYDROLASES; PEPTIDES; PHENYLALANINE; PIPERAZINES; VALINE