G. Romussi et al., CONSTITUENTS OF FAGACEAE (CUPULIFERAE) .1 9. TRITERPENE SAPONINS AND ACYLATED FLAVONOIDS FOR QUERCUS-ROBAR L VAR STENOCARPA BECK, Archiv der pharmazie, 327(10), 1994, pp. 643-645
In addition to four known glycosides from leaves of Quercus robur L. v
ar. stenocarpa Beck. a new triterpene saponin has been isolated and id
entified as 28-beta-D-glucopyranosyl ester of the 2 alpha,3 beta,19 al
pha-trihydroxy-olean-12-ene-24,28-dioic acid (1).