Studies on the Relationship of Structure to Antimicrobial Properties of Diterpenoid Compounds fromSideritis

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Abstract
As a result of a study of antimicrobial agents from Spanish Sideritis species, we now report a series of natural and semisynthetic diterpenoid compounds with selective antimicrobial activity toward Gram-positive bacteria and, in some cases, also toward yeasts. A 1,3-diolic group is responsible for this activity. Another hydroxyl group on the molecule produces a drastic decrease in antimicrobial activity. On the other hand, an acetoxyl group increases the inhibitory action. To the best of our knowledge, 1-acetyljativatriol (2) is the first natural ent-beyerenic diterpenoid which has been proved to show antimicrobial activity.

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