Fmoc-Lys(Boc)-OH-15N2 is an N labelled Fmoc-Lys(Boc)-OH(F622790), which is used to prepare dimeric RGD peptide-paclitaxel conjugate as model for integrin-targeted drug delivery and also used to synthesize DOTA-conjugated multivalent cyclic-RGD peptide dendrimers for tumor targeting and imaging use.