Pepticinnamins, new farnesyl-protein transferase inhibitors produced by an actinomycete. II. Structural elucidation of pepticinnamin E.

Structure of novel farnesyl transferase inhibitor, pepticinnamin E, is elucidated by NMR study. Pepticinnamin E is composed of five amino acids and o-pentenylcinnamic acid, having a molecular weight of 907. C-terminal glycylserine of the compounds is in the cyclized diketopiperazine form.