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HPLC chromatograms of prenylated flavanones 1, A–D classified with sub-index a, b, c, and d. a correspond to: Blank sample (ethanol: water, 70:30) permeated at chromatographic conditions of each prenylated flavanone; b correspond to prenylated flavanone standard; c correspond to prenylated flavanone from receptor compartment Franz diffusion cells; and, d correspond to prenylated flavanone extracted from human skin after permeation study.
