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It's not always the case, but I would have expected something as well as an unmeasurable B12
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Materials H-His(Trt)-OMeHCl, H-Lys(Boc)-OMeHCl, H-Lys-OMe2HCl, ((1H-Benzo[d][1,2,3]triazol-1-yl)oxy)tri(pyrrolidine-1-yl)phosphonium hexafluorophosphate(V) (PYBOP), 2-(1H-benzotriazole-1-yl)-1,1,3,3-tetramethyluronium hexafluorophosphate (HBTU), 1-hydroxy benzotriazole hydrate (HOBT), GHK and 4-carboxyphenyl boric acid were obtained from Bide Pharmatech Ltd (Shanghai, China)