New flavonoid glycosides from Aconitum naviculare (Brühl) Stapf, a medicinal herb from the trans-Himalayan region of Nepal

Three new flavonoid glycosides, 3-O-[β-d-glucopyranosyl-(1→3)-(4-O-trans-p-coumaroyl)-α-l-rhamnopyranosyl-(1→6)-β-d-glucopyranosyl]-7-O-[β-d-glucopyranosyl-(1→3)-α-l-rhamnopyranosyl]kaempferol, 3-O-[β-d-glucopyranosyl-(1→3)-(4-O-trans-p-coumaroyl)-α-l-rhamnopyranosyl-(1→6)-β-d-glucopyranosyl]-7-O-[β-d-glucopyranosyl-(1→3)-α-l-rhamnopyranosyl]quercetin and 7-O-[β-d-glucopyranosyl-(1→3)-α-l-rhamnopyranosyl]quercetin were isolated from the aqueous extract of the aerial parts of Aconitum naviculare. Their structures were elucidated by spectral analysis (HRAPI-TOF MS, 1H, 13C NMR, HMQC, HMBC, DFQ-COSY, ROESY and TOCSY).