Acylated flavonol glycosides from leaves of Stenochlaena palustris

From the leaves of Stenochlaena palustris five new O-acylated flavonol glyc osides, stenopalustrosides A-E (1-5), have been isolated along with five kn own compounds, kaempferol 3-O-(3"-O-E-p-coumaroyl)-(6"-O-E-feruloyl)-beta-D -glucopyranoside (6), kaempferol 3-O-(3",6"-di-O-E-p-coumaroyl)-beta-D-gluc opyranoside (7), kaempferol 3-O-(3"-O-E-p-coumaroyl)-beta-D-glucopyranoside (8), kaempferol 3-O-(6"-O-E-p-coumaroyl)-beta-D-glucopyranoside(9); and ka empferol 3-O-beta-D-glucopyranoside (10). The structures of the isolates we re elucidated by spectroscopic methods, mainly 1D and 2D NMR. Compounds 1-4 showed significant antibacterial activities against Gram-positive strains. The structural difference between the isolated antibacterial and nonantiba cterial compounds is discussed.