The EtOH extracts of the whole plants of afforded 17 new jatrophane diterpenoid esters, helioscopianoids A-Q (-), along with eight known compounds (-). Their structures were elucidated by extensive spectroscopic methods and Mo(OAc)-induced ECD analysis, and the structures of compounds , , and were confirmed by X-ray crystallography. Compounds - were evaluated for inhibitory effects on P-glycoprotein (P-gp) in an adriamycin (ADM)-resistant human breast adenocarcinoma cell line (MCF-7/ADR) and neuroprotective effects against serum deprivation-induced and rotenone-induced PC12 cell damage. Compounds and increased the accumulation of ADM in MCF-7/ADR cells by approximately 3-fold at a concentration of 20 μmol/L. Compound could attenuate rotenone-induced PC12 cell damage, and compounds , , and showed neuroprotective activities against serum deprivation-induced PC12 cell damage.
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