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One new clerodane-type diterpenoid, together with one known, was isolated from the leaves and twigs of  C. krabas . The structures of these compounds were elucidated as krabasinolide A ( 1 ) and taraxerol ( 2 ) by spectroscopic methods (UV, IR, HRESIMS, 1 D, and 2 D NMR), and the relative stereochemistry was confirmed by X-ray diffraction analysis with graphite monochromated Mo-Kα (λ = 0.71073 Å) radiation at 296(2) K. Extracts and compounds  1 - 2  were evaluated for  in vitro  antiviral activity.

Krabasinolide A with anti-HIVs activity from the leaves and twigs of Croton krabas