New cucurbitacin derivatives from bryonia dioica jacq.

Abstract
The isolation and structural elucidation of some new methoxy-containing artefacts from methanol extracts of Bryonia dioica roots is reported. Their isolation supports the suggestion that the isocucurbitacins (3-hydroxy-2-ketones) are not natural compounds but are really artefacts formed from the more usual 2-hydroxy-3-keto compounds.