Perez-Diaz, JOH; Vega-Baez, JL; Sandoval-Ramirez, J; Meza-Reyes, S; Montiel-Smith, S; Farfan, N; Santillan, R
(2010)
The E ring regioselective acid-catalyzed opening of spirostanic sapogenins possessing a carbonyl group at C-12, such as botogenin and hecogenin, provided the new 12,23-cyclo-22,26-epoxycholesta-11,22-diene skeleton, in ...