131766-24-0 BUBUC L-Threonine, N-(N-(N-(N-(S-(1,1-dimethylethyl)-N-L-tyrosyl-D-cysteinyl)glycyl)-L-phenylalanyl)-L-leucyl)-, 1,1-dimethylethyl ester Tyr-cys-(stbu)-gly-phe-leu-thr(otbu) Tyrosyl-cysteinyl(stbu)-glycyl-phenylalanyl-leucyl-threonyl(O-t-butyl)