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Fourier transformed infrared spectroscopy (FT-IR) spectra and 1H-nuclear magnetic resonance (1H-NMR) of glycyrrhetinic acid-modified chitosan (GA-CTS). (A) The mass spectrum of GA-CTS; the amide bond was formed by the carboxylic acid group of GA and the amino group of chitosan (CTS); (B) 1H-NMR of GA-CTS showing that GA was connected to CTS; (C) Synthetic scheme for GA-CTS.
