118573-63-0 Boc-ltgl Boc-lysinyl-tryptophyl-glycyl-lysine Butyloxycarbonyl-lysinyl-tryptophyl-glycyl-lysine L-Lysine, N2-(N-(N-(N2-((1,1-dimethylethoxy)carbonyl)-L-lysyl)-L-tryptophyl)glycyl)- Lys-trp-gly-lys otbu