Exolide A, structurally diverse Ent-18-norbeyerane diterpenoid from the stems of Indian mangrove plant, Excoecaria agallocha Linn.
Exolide A (1), a novel ent-18-norbeyerane diterpenoid possessing a hexacarbocyclic framework, 7/5/6/6/5/3 along with four known terpenoids (2-5) were isolated from the chloroform extract of the stems of Excoecaria agallocha. The structure of 1 was elucidated by comprehensive spectroscopic data analysis (IR, HRESIMS, 1H...