The chemical composition of the essential oils obtained from the flowering aerial parts of Marrubium vulgare L.. and Marrubium peregrinum L. were determined by GC/MS. Twelve components were identified in M. vulgare oil with β-caryophyllene (45.8%) and germacrene D (14.4%) being the major constituents. In M. peregrinum oil, sixteen compounds were identified with β-caryophyllene (31.3%), germacrene D (28.1%) and bicyclogermacrene (15.3%) predominating.
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Nagy et al. (1998) studied this question.
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