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The essential oil from the fruits of Zanthoxylum rhetsoides Drake (syn. Z. myriacanthum Wall. ex Hook. f.) of north-west Vietnamese origin consists of 78% of monoterpene hydrocarbons, 19% of oxygenated monoterpenes, 1% of n-alcohols and only 1% of sesquiterpenes. The essential oil from aerial parts of Zanthoxylum alatum Roxb. (syn. Z. armatum DC., Z. planispinium Sieb. et Zucc.) collected in north-west India contains 33% of monoterpene hydrocarbons. The main constituents are 1,8-cineole (15.7%, 18), linalol (18.8%, 28) and undecan-2-one (17.0%, 60).
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Weyerstahl et al. (1999) studied this question.
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