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(a) Chromatographic profiles at 280 nm of vessel supplemented with OP extract at time 0 (PC-OP), and after 9 days of treatment (PC-OP day 9 and DC-OP day 9); hydroxytyrosol (1), tyrosol (2), and verbascoside (3). (b) MS spectra of compounds 1 and 2 with the dimeric forms.
