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Which compound is the major component of orange oil?

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The major component of orange oil is d-limonene, which typically accounts for about 90 percent of the oil's composition.12

Limonene is a colorless liquid and a member of the monocyclic monoterpene hydrocarbons. While it is the primary constituent of orange oil, the oil also contains trace amounts of other compounds, such as indole and anthranilic acid esters, which contribute to its characteristic scent and flavor.321