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D-Alanine N-Carbobenzyloxy-L-alanine DL-Phenylalanine L-Alanine Z-BETA-ALA-ONP Z-DL-ALA-OH Melphalan N-Carbobenzyloxy-L-aspartic acid N-Cbz-L-Aspartic acid 4-tert-butyl ester N-CARBOBENZYLOXY-L-ASPARTIC ANHYDRIDE