Abstract
Two kinds of furanoid norditerpene glucosides, named diosbulbinosides D (I), mp 169-173°(dec.), [α] D-31°, and F (II), mp 193-195°(dec.), [α]350-25°, were isolated from the fresh root tubers of Dioscorea bulbifera L. forma spontanea MAKINO et NEMOTO. On the basis of chemical and spectral evidences I and II were assigned the structures, 6-O-β-D-glucopyranosides of the enol forms, 5-en-6-ols, of coexisting diosbulbins D (IV) and F (V), respectively. They are noted as the non-conjugated enol glucosides.
