N-alpha-Fmoc-N-beta-(4,4-dimethyl-2,6-dioxocyclohex-1-ylidene)-3-methylbutyl-L-2,3-diaminopropionic Acid is used in the synthesis of phenylpyrazolo[3,4-d]pyrimidine-peptide conjugates as Src kinase inhibitors. It is also used to prepare peptidomimetic ligands for α4β1 integrin on Jurkat T-leukemia cells.