The present invention relates to a macrolide compound expected to have a cell growth-inhibiting activity and a novel anticancer drug utilizing the compound. Specifically, the invention relates to a compound represented by Formula (I) or (II) or a pharmaceutically acceptable salt thereof and relates to a cell growth inhibitor and an anticancer drug each containing the compound or the salt as an active ingredient.
(−)-Exiguolide (1), isolatedfrom the marine sponge Geodia exigua, has been shown to inhibit the growth of the A549 human lung adenocarcinoma and NCI-H460 human lung large cell carcinoma cells in vitro. In this study, we synthesized structural analogues of 1 to explore its skeletal structure–activity relationships and found that the C18 methyl group and the configuration of the C16–C17 double bond