Fresh aerial parts of Tanacetum annuum L. from Morocco were steam distilled to produce an oil in 0.5% yield. The oil was fractionated on the silica gel column and analyzed by GC and GC/MS using MS and retention index data and more than 130 constituents were identified. The major components of the oil were chamazulene (38–17%), myrcene (14–1%), sabinene (8.6–4%), β-eudesmol (7–3%) and camphor (18–4%). Seasonal variation of the oil composition suggested that the chamazulene content decreases and the myrcene content increases from June to October.
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Greche et al. (1999) studied this question.