A new flavonol glycoside and other flavonoids from the aerial parts of Taverniera aegyptiaca

Isolation of flavonoids from the aerial parts of Taverniera aegyptiaca Bioss. (Fabaceae) led to identification of one new flavonol glycoside, isorhamnetin-3-O-alpha-l-rhamnopyranosyl-(1 -> 2)-alpha-l-arabinopyranoside (1), along with eleven compounds, which previously have not been isolated from this plant quercetin-3-O-alpha-l-rhamnopyranosyl-(1 -> 2)-[alpha-l-rhamnopyranosyl-(1 -> 6)-beta-d-galactopyranoside] (2), isorhamnetin-3-O-alpha-l-arabinopyranoside (3), quercetin-3-O-alpha-l-rhamnopyranosyl-(1 -> 6)-beta-d-glucopyranoside (4), isorhamnetin-3-O-alpha-l-rhamnopyranosyl-(1 -> 6)-beta-d-glucopyranoside (7), isorhamnetin 3-O-alpha-l-rhamnopyranosyl-(1 -> 2)-[alpha-l-rhamnopyranosyl-(1 -> 6)-beta-d-galactopyranoside] (8), isorhamnetin 3-O-alpha-l-rhamnopyranosyl-(1 -> 2)-[alpha-l-rhamnopyranosyl-(1 -> 6)-beta-d-glucopyranoside] (9), kaempferol 3-O-alpha-l-rhamnopyranosyl-(1 -> 2)-[alpha-l-rhamnopyranosyl-(1 -> 6)-beta-d-galactopyranoside] (10), isorhamnetin (11), 4,4 '-dihydroxy-2 '-methoxychalcone (12), formononetin (13) and calycosin (15)] and some compounds already known from this plant [quercetin-3-O-robinobioside (5), isorhamnetin-3-O-robinobioside (6), afrormosin (14) and odoratin (16)]. [GRAPHICS] .