Results To study the effect of hydrogen bonding in Asp-Phe-OMe, we have synthesized the ester and N-methyl analogues. The depsipeptide L-aspartyl-(S)-phenyllactic acid methyl ester (2) was prepared by coupling N-(benzyloxy-b, n: O (a) Address: IBM Research, San Jose, Calif. 95193:(b) Address: Department of Pharmaceutical Chemistry, School of Pharmacy, The Hebrew University, Jerusalem, Israel;(c) Address: University of California, ...