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The composition of the volatile oil from the rhizomes of Rheum palmatum L. has been investigated by capillary GC, GC-MS and 1H-NMR. The oil contained 108 volatile components of which 27.3% were terpenoid. The main constituents were palmitic acid (22.5%), paeonol (16.2%), α-copaene (9.8%), methyl stearate (9.3%), δ-cadinene (5.7%) and methyl eugenol (5.4%).
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Miyazawa et al. (1996) studied this question.
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