A New Flavonol Triglycoside from Eustoma grandiflorum

A new flavonol triglycoside, kaempferol 3-0-α-L-rhamnopyranosyl (1>6)-(3-0-E-p-coumaroyl)- β-D-galactopyranoside-7-0-α-L-rhamnopyranoside (1: Eustograndifloside A) was isolated from the flower of Eustoma grandiflonm in addition to eight known flavonols (2: kaempferol 3-0-a-L-rhamnopyranosyl (1->6)-(4-0-E-p-coumdarhyl)-m-D-galactopyraoside-7-0-α-L-rhamnopyranoside, ,3: kaempferol 3-0-β-robinobioside-7-0-α-L-rhamnopyranoside, 4: isorhamne-tin 3-0-α-L-rhamnopyranosyl (1->2). [α-L-rhamnopyranosyl (1->6)]-(4-O-E-p-couinaroyl)-β-D-galactopyrAnoside-7-0-α-L-rhamnopyranoside, 5: kaempferol 3-0-α-L-rhamnopyranosyl (1->2) [(X-L-rhamnopyranosyl (1-6)] (4-0-E-p-coumaroyl)-β-D-galactopyranoside-7-0-α-L-rhamnopyranoside, 6: kaempferol 3-0-β-robinobioside, 7: quercetin 3-0-β-robinobioside, 8: isorhamnetin 3-0-β-robinobioside, and 9: kaempferol 7-0-α-L-rhamnopyranoside) and two known secoiridoid glycosides (10: swertiamarin and 11: sweroside). The structure elucidation of these compounds was accomplished through analyses of spectroscopic, including 1D and 2D NMR, and ESIMS data.