1992 Volume 40 Issue 12 Pages 3169-3173
Fifteen new resin glycosides, marubajalapins I-XV, were isolated from the jalapin fraction of the aerial part (leaves and stems) of Pharbitis purpurea. Among them, the structures of marubajalapins I-VII have been determined on the basis of chemical and spectral data. They are the first examples of jalapins with operculinic acid E obtained previously as a minor glycosidic acid of the crude jalapin from Jalapae Braziliensis.