Baimantuoluolines D – F, Three New Withanolides from the Flower of Datura metel L.

Abstract Three new withanolide compounds, named baimantuoluolines D–F, along with three known withanolides and a lignan were isolated from the flower of Datura metel L., the parts effective against psoriasis. The structures of the new compounds were elucidated as (5 α ,6 β ,12 β ,20 R ,22 R ,24 R ,25 S )‐21,24‐epoxy‐5,6,12‐trihydroxy‐27‐methoxy‐1‐oxowith‐2‐enolide ( 1 ), (5 α ,6 β ,12 β ,20 R ,22 R ,24 R ,25 S )‐21,24‐epoxy‐5,6,12,27‐tetrahydroxy‐1‐oxowith‐2‐enolide ( 2 ), and (5 α ,6 β ,12 β ,22 R )‐5,6,12,21‐tetrahydroxy‐1‐oxowith‐24‐enolide( 3 ) on the basis of physicochemical evidence.