N-T-BOC-ALA-PRO-NVA P-CHLOROTHIOBENZYL ESTER BOC-ALA-PRO-NVA-4-CHLORO-SBZL ELASTASE SUBSTRATE VI N-tert-BOC-Ala-Pro-Nva-p-chlorothiobenzyl ester Boc-Ala-Pro-Nva p-chlorothiobenzyl ester L-Norvaline, N-[1-[N-[(1,1-dimethylethoxy)carbonyl]-L-alanyl]-L-prolyl]thio-, S-[(4-chlorophenyl)methyl] ester (9CI) S-[(4-chlorophenyl)methyl] 2-[[1-[2-[(2-methylpropan-2-yl)oxycarbonylamino]propanoyl]pyrrolidine-2-carbonyl]amino]pentanethioate