98849-86-6 EK 399 Ekk-399 L-Phenylalanine, L-tyrosyl-4-(methylsulfinyl)-D-2-aminobutanoylglycyl-N-ethyl-, 2-acetylhydrazide, monoacetate (salt) Tyr-met(O)-gly-etphe-nhnhcoch3 Tyrosyl-methionyl(O)-glycyl-ethylphenylalanine-2-acetylhydrazide