STUDIES ON THE CHEMICAL CONSTITUENTS OF AJUGA FORRESTII DIELS

Two new abietane type diterpenoids,ajuforrestin A and B have been isolated fromthe whole plant materials of Ajuga forrestii Diels. Their structures ,12 ,16-epoxy-11,14-dihydroxy-3,5,8,11,13,15-abietahexaene-7-one and 12,16-epoxy-11,14-dihydroxy-3,5,8,11,13-abietapentaene-7-one were established by spectroscopic means and comparison with closely relatedcompounds.The structure of ajuforrestin A was also confirmed by single-crystal X-ray analysis.Three known flavonols,apigenin,acacetin and gnetifolin B were also obtained. Gnetifolin B was firstisolated from the Ajuga genus.