Flavonol glycosides, nigelflavonosides A–F from the whole plant of Nigella glandulifera (Ranunculaceae)

Six new flavonol glycosides, nigelflavonosides A–F (1–6), together with a known compound (7) were isolated from the whole plant of Nigella glandulifera Freyn et Sint (Ranunculaceae). Structure elucidation, especially the localization of the glycosyl or acetyl groups, and complete 1H- and 13C-NMR assignments of these compounds were carried out using one- and two-dimensional NMR measurements, including 1H- and 13C-NMR, 1H–1H COSY, TOCSY, HMQC, HMBC and NOESY, in addition to HRESI–TOF–MS experiments.