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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 (http://creativecommons.org/licenses/by/4.0/).
Chemical structures of representative major compounds for the orange essential oil and its concentrated oils, ordered as: (A) hydrocarbon monoterpenes; (B) oxygenated monoterpenes; (C) hydrocarbon sesquiterpenes; (D) oxygenated compounds.