Fig. 1. Synthetic scheme of PAMAM-Suc-Phe and PAMAM-Phe-Suc. HBTU, DCC, and TFA are 1-[bis(dimethylamino)methyliumyl]-1H-benzotriazole-3-oxide hexafluorophosphate, N,N′-dicyclohexylcarbodiimide, and trifluoroacetic acid, respectively.
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