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(A) Preparation of bifunctional dendrimer (2), and PDP-functionalized PAMAM G4-OH dendrimer (G4-OH-PDP, 3). (B) Synthesis of model compound 5. G4-OH-PDP (3) was reduced by TECP in PBS buffer resulting free thiol intermediate, 4 which again reacted with EMCH to get model compound (5) under nitrogen at 0°C.
