Euphosantianane E-G: Three New Premyrsinane Type Diterpenoids from with Contribution to Chemotaxonomy.

species were widely used in traditional medicines for the treatment of several diseases. From the aerial parts of Egyptian endemic plant, , three new premyrsinane diterpenoids, namely, euphosantianane E-G (-), alongside four known triterpenes, 9,19-cyclolanostane-3β,24-diol (), 25-methoxycycloartane-3β,24-diol (), 25-methylenecycloartan-3β,24-diol (), and 25-methylenecycloartan-3β,24-diol (), were isolated and identified. The chemical structures were proven depending upon spectroscopic analysis, including FTIR, HRFABMS, and 1D/2D-NMR. The chemotaxonomic significance of the isolated compounds, especially diterpenes from compared to those documented from different species was also studied via agglomerative hierarchical clustering (AHC). The Egyptian endemic was grouped with , , , subsp. , , and , where myrsinol diterpenoids were the characteristic compounds.