New kaempferol 3,7-diglycosides from Asplenium ruta-muraria and Asplenium altajense.

A flavonoid was isolated from the fronds of Asplenium ruta-muraria and A. altajense (Aspleniaceae) collected in the Altai Mountains and adjacent area. The compound was identified as kaempferol 3-O-β-[(6'''-E-caffeoylglucopyranosyl)-(1-->3)-glucopyranoside]-7-O-β-glucopyranoside (1) by UV, 1H and 13C NMR spectroscopy, LC-MS, and acid and alkaline hydrolyses.