A new acylated quercetin glycoside and other secondary metabolites from Helleborus foetidus

A new acylated flavonol glycoside, quercetin 3-O-(2-trans-caffeoyl)-α-l-arabinopyranosyl-(1 → 2)-β-d-glucopyranoside (1), together with the known 25R,26-[(β-d-glucopyranosyl)oxy]-22α-hydroxy-5β-furostan-3-β-yl O-α-l-rhamnopyranosyl-(1→4)-β-d-glucopyranoside (2), anemonin (3), β-d-glucosyl-p-hydroxyphenylethyl alcohol (4), and 1-β-O-caffeoyl-d-glucose (5) were isolated from Helleborus foetidus leaves and identified on the basis of detailed spectral analysis.