The essential oil of Conyza sumatrensis (Retz) Walk, an endemic species of Amazon forest, obtained by steam distillation of the leaves, has been analyzed by GC/MS, Kovats indices and 1H- and 13C-NMR spectroscopy. Lachnophyllum ester, an acetylenic compound was found to be the major component of the oil.
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Machado et al. (1995) studied this question.
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