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Fourier transform infrared spectroscopy spectra of isopentyl caffeate (ICaf), β-cyclodextrin (β-CD), and inclusion complex prepared by physical mixture (PM), kneading (KN) and co-evaporation (CO) using molar ratios of (ICaf:β-CD) of (A) 0.25:1, (B) 1:1 and (C) 2:1.
