Abstract
An alkaloid of the molecular formula C (21)H (19)NO (6) was isolated from the roots of berberis actinacantha. Substructures were derived from proton and carbon-13-NMR data. Single-crystal x-ray diffractometry identified the alkaloid as 15( R,S)-3,4-dimethoxy-11,12-methylenedioxy-8,14-dioxo-hexahydro- ISO-homoprotoberberin. ORTEP plots, bond angles, assigned carbon-13 and proton NMR data are given.
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