Which of the following tripeptides is formed when alanine is treated with isobutylene/H (cat) and glycine is treated with carbobenzoxy chloride (CbzCl)/pyr and the resulting intermediates are reacted in the presence of DCC followed by treatment with H2, Pd(C ).The dipeptide is then reacted with Boc-protected valine in the presence of DCC followed by treatment with trifluoroacetic acid (TFA)?
A. Pro-Ala-Leu
B. Leu-Ala-Pro
C. Pro-Leu-Ala
D. Ala-Pro-Leu