A New Polyoxygenated Triterpene and Two New Aeginetic Acid Quinovosides from the Roots of Rehmannia glutinosa

A new minor polyoxygenated triterpene named glutinolic acid (1) and two new aeginetic acid quinovosides (2,3) were isolated from the roots of Rehmannia glutinosa LIBOSCH. (Scrophulariaceae) cultivated in Gunwi-gun, Korea. The structures of these compounds were established as 3 alpha,19 alpha,20 beta,24,30-pentahydroxyurs-12-en-28-oic acid (1, glutinolic acid), aeginetic acid 5-O-beta-D-quinovoside (2) and aeginetoyl ajugol 5 ''-O-beta-D-quinovoside (3) on the basis of chemical and spectroscopic evidence.