Abstract
A new natural product has been obtained from the roots of “Carrizo citrange” rootstocks (Citrus sinensis × Citrus trifoliata) infected by the nematode Tylenchulus semipenetrans, and its structure identified as the diterpene carnosic acid-11-methylether (1) on the basis of spectroscopic data and chemical means. The known compounds β-sitosterol (sterol), lupeol (triterpene), 5-hydroxy-3,7,3′,4′-tretramethoxy-flavone and 5-hydroxy-6,7,3′,4′-tetramethoxy-flavone (flavones), citracridone-I (alkaloid) and xanthyletin, nordentatin and poncitrin (chromenecoumarins), were isolated from the same source.
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