D-N-acetylphenylalanine p-nitrophenyl ester, p-nitrophenyl N-acetyl-D-phenylalaninate, N-acetyl-D-phenylalanine 4-nitrophenyl ester, Phe-NPE, N-ACETYL-DL-PHENYLALANINE P-NITROPHENYL ESTER, N-Acetyl-DL-phenylalanine 4-nitrophenyl ester, AC-DL-PHENYLALANINE-ONP, ACETYL-DL-PHENYLALANINE 4-NITROPHENYL ESTER, p-nitrophenyl N-acetyl-D-phenylalanate, Ac-D-Phe-ONP, 4-nitrophenyl N-acetyl-3-phenyl-DL-alaninate, N-Acetyl-D-phenylalanin-p-nitrophenylester