L-??? L-(-)-?? L-tert-Leucine L-Alanyl-L-Glutamine N-CARBOBENZOXY-DL-LEUCINE HIPPURYL-HIS-LEU Leucine aminopeptidase，porcine kidney L-Leu-Leu-Leu Z-LEU-LEU-OH N-BENZYLOXYCARBONYL-L-ALANYL-L-LEUCINE,N-CARBOBENZOXY-L-ALANYL-L-LEUCINE,Z-L-ALANYL-L-LEUCINE H-VAL-LEU-OH H-TYR-LEU-OH GLYCYL-L-ALANYL-L-LEUCINE H-HIS-LEU-OH THR-VAL-LEU H-LEU-TYR-LEU-OH Z-PHE-LEU-OH Z-TYR-LEU-OH