New Alkaloids and a Tetraflavonoid from <i>Cephalotaxus </i><i>w</i><i>ilsoniana</i>

A new homoerythrina alkaloid, C-3-epi-wilsonione (<b>1</b>), a new tetraflavonoid, taiwanhomoflavone C (<b>2</b>), and a new stereoisomer of desmethylcephalotaxinone (<b>3</b>) have been isolated from the leaves and heartwood of <i>Cephalotaxus wilsoniana</i>, respectively. The structures were elucidated by spectroscopic methods. Compound <b>1</b> showed cytotoxic activity against a number of human cancer cell lines in vitro.