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Z-HIS(BZL)-OH Z-D-ARG-OH Cbz-D-Tryptophan methyl ester N-Cbz-D-Tryptophan Z-D-VAL-OSU N-Glycyl-L-tyrosine H-ILE-TYR-OH L-Tyrosine H-GAMMA-GLU-TYR-OH 3-(4-Hydroxyphenyl)propionic acid