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Euphorfinoids A and B ( 1  and  2 ), a pair of  ent -atisane diterpenoid epimers with a vicinal 2,3-diol moiety, together with four known analogues ( 3–6 ), were isolated from the roots of wild  Euphorbia fischeriana . Their structures were elucidated by spectroscopic analysis, including extensive NMR, HR-ESIMS, NMR calculations, X-ray diffraction, and comparison with structurally related known analogues. Our bioassays have established that compound  1  displayed moderate anti-proliferative effects on Hcc1806 cell line with IC 50  15.53 ± 0.21 μM, and compound  5  showed remarkable inhibitory effects against AChE with IC 50  32.56 ± 2.74 μM by an  in vitro  screened experiment.

Euphorfinoids A and B, a pair of ent -atisane diterpenoid epimers from the roots of Euphorbia fischeriana, and their bioactivities