Yaun-Chao Huang et al.
Journal of natural products, 72(7), 1273-1278 (2009-07-09)
Eight new prenylated flavonoids, ugonins M-T (1-8), together with five known compounds, ugonins J-L (9-11), 5,4'-dihydroxy-4'',4''-dimethyl-5''-methyl-5''H-dihydrofurano[2'',3'':6,7]flavanone, and quercetin, were isolated and purified from the rhizomes of Helminthostachys zeylanica. The structures of the new isolates were elucidated by spectroscopic and chemical