Three new sesquiterpenoids were obtained from the leaves of Magnolia grandi
flora L. Their structures were determined as 6 alpha ,11-dihydroxy-12,13-di
acetoxyelem-1,3-diene, 4 alpha, 6 alpha ,10 alpha -trihydroxy-13-acetoxygua
ia-11-ene, and 12,13-diacetoxyguaia-4 alpha ,6 alpha ,10 alpha ,11-tetraol
on the basis of spectral evidence. In addition, the known sesquiterpenoid m
agnograndiolide was also obtained.