ACETYL-L-PHENYLALANINE ETHYL ESTER;AC-PHE-OET;AC-PHENYLALANINE-OET;N-ACETYL-L-PHE ETHYL ESTER;N-ACETYL-L-PHENYLALANINE ETHYL ESTER;N-ALPHA-ACETYL-L-PHENYLALANINE ETHYL ESTER;ethyl N-acetyl-3-phenyl-L-alaninate;N-acetyl-L-phenylalanine ethyl ester*sigma grade