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A new highly oxygenated  ent -atisane diterpenoid, namely excagallonoid A ( 1 ), together with five known analogues ( 2  −  6 ) were isolated from the leaves and twigs of  Excoecaria agallocha . Their structures were elucidated on the basis of extensive spectroscopic analyses (HRESIMS, UV, IR, 1 D and 2 D NMR), and the absolute configurations of  1  and  5  were determined by single-crystal X-ray diffraction. Compound  1  represents the first example of an  ent -atisane diterpenoid featuring a vicinal 2,3-diol moiety. Compounds  1  and  4  exhibited weak cytotoxicities  in vitro  against RKO colon cancer cells with IC 50  values of 28.7 ± 1.98 and 32.6 ± 2.81 µM, respectively.

Highly oxygenated ent -atisane and podocarpane diterpenoids from Excoecaria agallocha