Four flavonols form the whole plant of Nervilia aragoana

Abstract

Four flavonols, including rhamnazin (1), nervilifordizin A, B (2, 3) and nervilifordin B (4) were isolated from the whole plant of Nervilia aragoana. All the compounds (1-4) were found for the first time from this species. Their structures were elucidated by 1D, 2D-NMR and compared with published data.