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HPLC chromatogram of the extract from leaves of O. europea ‘beleidi’ cultivar (a) and detail of 18–30 min retention time (b): 1: vanillin (Rt = 18.8 min), 2: rutin (Rt = 21.05 min), 3: luteolin 7-O-glucoside (Rt = 22.14 min), 4: oleuropein (Rt = 24.9 min) and 5: quercetin (Rt = 29.9 min). Detection was at 254 nm
