(2S)-2-[[(2S)-2-[[2-[[(2R)-2-[[(2S)-2-amino-3-(4-hydroxyphenyl)propano yl]amino]propanoyl]amino]acetyl]amino]-3-phenyl-propanoyl]amino]-3-phe nylmethoxy-propanoic acid;enkephalin, Ala(2)-O-benzyl-Ser(5)-
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