Reaction scheme for creating click-conjugated dendrons employed in the in vitro studies. (i) glutaric anhydride, MeOH, 24 hrs, r.t. (ii) EDC, c(RGDyK), H2O/DMSO, 2 days, r.t. (iii) Alexa Fluor 488 azide OR biotin-dPEG3+4-azide OR MTX-azide(5) OP azide-G2(AF)2(OH)24 (9) sodium ascorbate, copper (II) sulfate, H2O, 36 hours, r.t.