β-Casomorphins: substitution of phenylalanine with β- homo phenylalanine increases the μ-type opioid receptor affinity

β-Casomorphins: substitution of phenylalanine with β- homo phenylalanine increases the μ-type opioid receptor affinity Synthesis and binding activity of endomorphin-1 analogues containing β-amino acids Cyclic .beta.-Casomorphin Analogs with Mixed .mu. Agonist/.delta. Antagonist Properties: Synthesis, Pharmacological Characterization, and Conformational Aspects Endomorphin-1 Analogues Containing β-Proline Are μ-Opioid Receptor Agonists and Display Enhanced Enzymatic Hydrolysis Resistance Dermorphin and deltorphin heptapeptide analogues: replacement of Phe residue by Dmp greatly improves opioid receptor affinity and selectivity (4-Carboxamido)phenylalanine is a surrogate for tyrosine in opioid receptor peptide ligands Syntheses and opioid receptor binding properties of carboxamido-substituted opioids Immunosuppressant activity in human β-casein fragment analogs Potent μ-Opioid Receptor Agonists from Cyclic Peptides Tyr-c[<scp>d</scp>-Lys-Xxx-Tyr-Gly]: Synthesis, Biological, and Structural Evaluation Probes for narcotic receptor mediated phenomena. 48. C7- and C8-substituted 5-phenylmorphan opioids from diastereoselective alkylation