179124-36-8 Boc-tyr-pro-gly-phe-leu-thr(O-t-Bu) Boc-ypgflt(O-tbu) L-Threonine, N-(N-(N-(N-(1-(N-((1,1-dimethylethoxy)carbonyl)-L-tyrosyl)-L-prolyl)glycyl)-L-phenylalanyl)-L-leucyl)-O-(1,1-dimethylethyl)- tert-Butyloxycarbonyl-tyrosyl-prolyl-glycyl-phenylalanyl-leucyl-(O-tert-butyl)threonine