A new diterpene, named rosmariquinone, was isolated from the leaves of Rosmarinus officinalis L. The leaves were first extracted using methanol and, upon further purification, this extract yielded rosmariquinone. Structure elucidation of the antioxidant was done using IR, MS, 1 H‐NMR and 13 C‐NMR.
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Houlihan et al. (1985) studied this question.