New antimicrobial substances against Streptomyces scabies, rosmic acid and rosmanol-related compounds, were isolated from leaves of rosemary (Rosmarinus officinalis L.). The active compounds were separated in pure form by a combination of gel permeation chromatography and reverse-phase HPLC. Their structures were determined by two-dimensional NMR experiments and HR-MS analyses.
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Watanabe et al. (1997) studied this question.