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A novel chlorinated diterpene quinone methide; chlorosmaridione (7-chloro-hydroxy-abeita-7,9(11),13-triene-6,12-dione) was isolated from petroleum ether extract of the sterns of Rosemarinus officinalis L. growing in Egype. In addition, β-sitosterol, stigmasterol, lupeol acetate, α-amyrin, β-amyrin, lupeol, acetyloleanolic acid, acetylursolic acid taxodione, horminone, and cryptotanshinone were also identified. Chemical structrues of the isolated compounds have been elucidated on the bases of physical, chemical, and spectral data including IR, UV, MS, ID and 2D-NMR spectra.
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