ACETYL-L-TRYPTOPHAN 4-NITROPHENYL ESTER AC-TRP-ONP AC-TRYPTOPHAN-ONP Nalpha-Acetyl-L-tryptophan 4-nitrophenyl ester Ac-L-Trp-ONp Nα-Acetyl-L-tryptophan 4-nitrophenyl ester≥ 98% (TLC) 4-nitrophenyl (2S)-2-acetamido-3-(1H-indol-3-yl)propanoate L-Tryptophan, N-acetyl-, 4-nitrophenyl ester