Thirteen limonoids with a new carbon skeleton, the xylogranatinsF-R (1-13), have been isolated from the seeds of a Chinesemangrove, Xylocarpusgranatum; two recently reported compounds, xylogranatins C and D were also isolated. Their structures were elucidated on the basis of spectroscopic data and chemical methods. The absolute configurations of these compounds were determined by using the modified