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Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/).
(A) Leaves of O. europaea cv. Caiazzana (i) and OLC extract therefrom (ii); (B) HPLC-UV chromatograms with the UV-DAD spectrum of a secoiridoid compound; (C) calculated amounts (%) of quantified compounds in OLC.