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The structures and UPLC chromatograms of effects of solid-phase extraction (SPE) purification of nobiletin, tangeretin, and 5-demethylnobiletin (λ = 330 nm). (A) Structures of nobiletin, tangeretin, and 5-demethylnobiletin; (B) Crude extracts of Ougan peel; (C) SPE-refined polymethoxyflavone (PMF) enrichment extraction.
