Lactonecembranoids from <i>Croton laevigatus</i> ZouGuo-An DingGang SuZhi-Heng YangJun-Shan ZhangHone-Wu PengChao-Zhong AisaHaiji Akber ZouZhong-Mei 2010 Six new cembranoids, laevigatlactones A−F (<b>1</b>−<b>6</b>), and the known compound neocrotocembraneic acid (<b>7</b>) were isolated from leaves of <i>Croton laevigatus</i>. Their structures were elucidated on the basis of spectroscopic analysis, and that of <b>1</b> was confirmed by X-ray crystallography. Compound <b>2</b> exhibited modest cytotoxicity against HeLa cells, with an IC<sub>50</sub> value of 38.4 μM.