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N-Boc-L-Histidine L-Histidine p-Toluic acid Boc-Aib-OH Triphenylmethyl Chloride N-Boc-N'-Cbz-L-lysine N-alpha-t-Butyloxycarbonyl-N-epsilon-benzyloxycarbonyl-L-lysinol Boc-D-Ser(Bzl)-OH N-BOC-O-Benzyl-L-serine BOC-GLY-LEU-OH