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ATR-FTIR spectra of raw materials and tablets. (A) Raw materials: ACV, hydroxypropyl methylcellulose (HPMC), iota-carrageenan (iota-CG), magnesium stearate (MgSt); (B) blank tablets (H, I, IH1, IH2); and (C) tablets with ACV (ACV-H, ACV-I, ACV-IH1, ACV-IH2).
