134124-09-7 2H-Tetrazole-2-acetic acid, alpha-methyl-5-(1-((phenylmethoxy)carbonyl)-2-pyrrolidinyl)-, phenylmethyl ester, (S-(R*,R*))- Benzyloxycarbonyl-prolyl-psi(CN4)-alanine benzyl ester Z-Pro-psi(CN4)-ala-obz