(2S)-2-[[(2S)-2-[[2-[[2-[[(2S)-2-amino-3-(4-hydroxyphenyl)propanoyl]amino]acetyl]amino]acetyl]amino]-3-phenylpropanoyl]amino]-4-methylsulfanylbutanoic acid (2S)-2-[[(2S)-2-[[2-[[2-[[(2S)-2-amino-3-(4-hydroxyphenyl)propanoyl]amino]acetyl]amino]acetyl]amino]-3-phenyl-propanoyl]amino]-4-methylsulfanyl-butanoic acid (2S)-2-[[(2S)-2-[[2-[[2-[[(2S)-2-amino-3-(4-hydroxyphenyl)-1-oxopropyl]amino]-1-oxoethyl]amino]-1-oxoethyl]amino]-1-oxo-3-phenylpropyl]amino]-4-(methylthio)butanoic acid (2S)-2-[[(2S)-2-[[2-[[2-[[(2S)-2-amino-3-(4-hydroxyphenyl)propanoyl]amino]acetyl]amino]acetyl]amino]-3-phenyl-propanoyl]amino]-4-(methylthio)butyric acid (2S)-2-[[(2S)-2-[2-[2-[[(2S)-2-amino-3-(4-hydroxyphenyl)propanoyl]amino]ethanoylamino]ethanoylamino]-3-phenyl-propanoyl]amino]-4-methylsulfanyl-butanoic acid 58569-55-4 Methionine enkephalin [Met5]Enkephalin acetate salt hydrate AIDS-000187 TYR-GLY-GLY-PHE-MET C11684 Met-Enk NCGC00163683-01 [Met]enkephalin [5-Methionine]Enkephalin AIDS000187 Enkephalin M M6638_SIGMA MET-enkephalin