Chemical constituents from the roots of Euphorbia nematocypha Hand.-Mazz.

A new myrsinol-type diterpene (1), three myrsinol-type diterpenes (2-4), three ent-abietane-type diterpenes (5-7), one tigliane-type diterpene (8), two cycloartane-type triterpenes (9-10), and two tirucallane-type triterpenes (11-12) were isolated from the roots of Euphorbia nematocypha Hand.-Mazz. Their structures were identified by spectroscopic analyses and by comparison of their spectral data with those reported in the literature. Compound 12 was isolated and reported from plants for the first time. All compounds were isolated from E. nematocypha for the first time.