Seven flavanol derivatives, including three biflavanoids (1-3), two flavonoids (4 and 5), and two spirobiflavonoids (6 and 7), were isolated from the bark of Nothotsuga longibracteata. The structure of the undescribed compound 1 was elucidated based on HR-ESIMS, NMR spectroscopy, and electronic circular dichroism (ECD) calculations. All isolated flavanol derivatives were screened for their antioxidant capacity to scavenge DPPH and ABTS+.
Keywords: Nothotsuga longibracteata; antioxidant activity; biflavanol; pinaceae.