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. 2021 Feb 15;13(2):261. doi: 10.3390/pharmaceutics13020261

Figure 5.

Figure 5

1H-NMR spectra of (A) phenylethylamine, (B) piperine, (C) cationic β-cyclodextrin-based polymer, and (D) cationic β-cyclodextrin-based polymer loaded with phenylethylamine and piperine; the molecular structures and proton assignments of the drug molecules are shown on the left.