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Phytochemical compounds of STE. (A) HPLC chromatograms of standards and sweet tea extract (STE) at 280 nm. The labeled number represents the compound: 1, isoquercitrin; 2, phloridzin; 3, trilobatin; and 4, phloretin. (B) The structures of isoquercitrin, phloridzin, trilobatin, and phloretin.
