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. 2020 Nov 12;15:8875–8892. doi: 10.2147/IJN.S270208

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© 2020 Lu et al.

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The synthetic mechanism and ¹H-NMR spectrum of PEI-PEG-TAT-AT7 (PPTA). (A) The whole process of PPTA synthesis was divided into two steps as presented. (B–E) ¹H NMR spectra of PEI, TAT-AT7, NHS-PEG-MAL, and PPTA.