This work was funded by the National Natural Science Foundation of China and Yunnan Province(U0832603);the National Science Foundation of China for Distinguished Young Scholars(81025023);the West Light Foundation of the Chinese Academy of Sciences,the International Foundation for Science(No.F/5202-1);the Youth Innovation Promotion Association,CAS.
Eleven new secoiridoid aglycones involving unusual C9-skeleton:swerimilegenins A-F(1-6);bis-C9-skeleton:swerimilegenin G(7);and C_(10)-skeleton:swerimilegenins H−K(8−11),as well as six known ones,were isolated from th...