The essential oil of the aerial parts of Ophryosporus heptanthus (Asteraceae) from Bolivia was analyzed by GC and GC/MS. The oil was characterized by a high percentage of santolinatriene (∼ 47%) and the presence of precocene II (∼ 8%) as the most important minor constituent. The other compounds were monoterpenes (∼ 16%), with p-cymene as the major compound (∼ 4.8%), sesquiterpenes (∼ 6%), oxygenated sesquiterpenes (∼ 8%) and oxygenated monoterpenes (∼ 4.5%).
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Arze et al. (2004) studied this question.
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