Agarofuran-, eudesmane- and eremophilane-type sesquiterpenoids from alpinia japonica (THUNB.)MIQ.

Three new sesquiterpenoids, 3α, 4α-oxidoagarofuran, 3β, 4β-oxidoagarofuran, 3β, 4β-oxidoagarofuran and Δ9 (10)-eremophilen-11-ol, as well as 10-epi-γ-eudesmol, 4α-hydroxydihydroagarofuran, α-agarofuran, dihydroagarofuran and β-eudesmol were isolated from the rhizome of Alpinia japonica. Their structures were determined by chemical and spectroscopic methods. It is interesting from a biogenetic point of view that Δ9 (10)-eremophilen-11-ol,...