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Incarvilleatone (1), an unprecedented dimeric cyclohexylethanoid analog with a racemic nature, was isolated from the whole plant of Incarvillea younghusbandii. HPLC chiral separation of 1 gave two enantiomers (-)-incarvilleatone and (+)-incarvilleatone. The structure of 1 was established by spectroscopic methods and single crystal X-ray diffraction. The absolute configurations of enantiomers were determined by quantum mechanical calculation. (-)-Incarvilleatone exhibited a potent inhibitory effect against NO production in LPS-induced RAW264.7 macrophages.
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Gao et al. (2012) studied this question.
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