N-BOC-PHE-ALA-ALA-P-NITRO-PHE-PHE-VAL-LEU-4-HYDROXYMETHYLPYRIDINE ESTER Boc-Phe-Ala-Ala-p-nitro-Phe-Phe-Val-Leu-pyridin-4-ylmethyl ester N-T-boc-phe-ala-ala-P-nitro-phe-phe-*val-leu 4-hy N-T-BOC-PHE-ALA-ALA-P-NITRO-PHE-PHE-VAL- LEU 4-HYDR Boc-Phe-Ala-P-Nitro-Phe-Phe-Val-Leu-4-Hydroxy-methylpyridine ester BOC-PHE-ALA-ALA-4-NITRO-PHE-PHE-VAL-LEU-PYRIDIN-4-YLMETHYL ESTER BOC-PHE-ALA-ALA-P-NITRO-PHE-PHE-VAL-LEU-4-(HYDROXYMETHYL)PYRIDINE ESTER N-BOC-Phe-Ala-Ala-p-nitro-Phe-Phe-Val-Leu methylpyridine