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The essential oil of two wild plants from Corsica, Calamintha nepeta subsp. glandulosa and Calamintha nepeta subsp. nepeta, were analyzed by Carbon-13 NMR spectroscopy and GC. The most frequent chemotype was menthone/pulegone. However, the menthone/pulegone ratio varies greatly according to the sample studied and the vegetative state of the plant.
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Ristorcelli et al. (1996) studied this question.
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