Bioactive Diterpenoids, a New Jatrophane and Two <i>e</i><i>nt</i>-Abietanes, and Other Constituents from <i>Euphorbia </i><i>p</i><i>ubescens</i>

Abstract

A new jatrophane diterpene, pubescenol (1), known ent-abietane lactones, helioscopinolide A (2) and B (3), and taraxerone, 24-methylenecycloartanol, and vanillin have been isolated from Euphorbia pubescens. Diterpenes 1-3 and previously described pubescene D (4) were shown to be moderate inhibitors of the growth of MCF-7, NCI-H460, and SF-268 human tumor cell lines, whereas compounds 2 and 3 also exhibited significant antibacterial activity against Staphylococcus aureus.