Secoatisane‐ and Isopimarane‐Type Diterpenoids from the Chinese Mangrove Excoecaria agallocha L.

Phytochemical investigations of the stems and leaves of the Chinese mangrove Excoecaria agallocha L. yielded one new secoatisane‐type diterpenoid, agallochaol C (1), three new isopimarane‐type diterpenoids, agallochaols D–F (2–4), along with four known diterpenoids 5–8. The structures of new compounds 1–4 were determined on the basis of spectroscopic‐data interpretation and chemical evidence.