Fig. 1: Epimerization-resistance direct aminolysis mediated proteinogenic tetrapeptide cyclization.
From: Production of constrained L-cyclo-tetrapeptides by epimerization-resistant direct aminolysis
a Extant activation mode. b β-Thiolactone facilitated tetracyclic peptide formation (This study). Inset: Challenging-to-synthesize l-cyclic tetrapeptides.
