Calyciphyllines A and B, Two Novel Hexacyclic Alkaloids from <i>Daphniphyllum </i><i>c</i><i>alycinum</i>

Abstract

[structure: see text] Two types of Daphniphyllum alkaloids with unprecedented fused-hexacyclic ring systems, calyciphyllines A (1) and B (2), have been isolated from the leaves of Daphniphyllum calycinum (Daphniphyllaceae), and the structures and relative stereochemistry were elucidated on the basis of spectroscopic data.