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Synthesis of Boc-protected bola dendrimer 7 connected with amide bonds or Boc-protected bola dendrimer 8 connected with ester bonds. Reagents, conditions: (e) DCC/HOSu, MeOH/THF, 96 h, r.t., 66.9% yield for 7 or DCC/DMAP/THF, 96 h, r.t., 58.1% yield for 8.
