Flavonol glycosides of Maesa lanceolata leaves

An investigation of the methanolic extract of Maesa lanceolata leaves has led to the isolation of four novel flavonol glycosides characterised as myricetin 3-O-2″, 3″, 4″-triacetylxylopyranoside (1), quercetin 3-O-β-3‴, 6‴-diacetylglucopyranosyl-(1→4)-α-2″, 3″-diacetylrhamnopyranoside (2), myricetin 3-O-xylopyranosyl-(1→3)-α-rhamnopyranoside (3) and quercetin 3-O-β-galactopyranosyl-(1→4)-α-rhamnopyranoside- 7-O-β-galactopyranoside (4). Also isolated from the same extract were known flavonols; quercetin (5), myricetin (6), quercetin 3-O-xylopyranoside (7), quercetin 3-O-α-rhamnopyranoside (8), myricetin 3-O-α-rhamnopyranoside (9), myricetin 3-O-β- galactopyranoside (10) and quercetin 3-O-rutinoside (11).