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HPLC chromatogram of a standard mixture of polyphenolic compounds. Peaks: 1, Hydroxytyrosol; 2, Tyrosol; 3, 4-hydroxybenzoic acid; 4, verbascoside; 5, apigenin-7-glucoside; 6, Oleuropein; 7, Quercetin; 8, Pinoresinol; 9, cinnamic acid; 10, apigenin.
