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Heliosterpenoids A and B ( 1  and  2 ), two unprecedented jatrophane-derived diterpenoid esters with a novel 5/6/4/6-fused tetracyclic ring skeleton, were isolated from the whole plants of  Euphorbia helioscopia . The structures of  1  and  2  were elucidated by extensive spectroscopic methods and electronic circular dichroism (ECD) analyses. The plausible biogenetic pathways of  1  and  2  were postulated.  1  and  2  were found to be potent inhibitors of P-glycoprotein (ABCB1) and  1  also exhibited cytotoxicity against MDA-MB-231 cell lines.

Heliosterpenoids A and B, two Novel Jatrophane-Derived Diterpenoids with a 5/6/4/6 Ring System from Euphorbia helioscopia