Three novel sesquiterpene polyol esters from the root bark of Maxim and their nitric oxide inhibitory activity.

Three new sesquiterpene polyol ester compounds angulatin V [1,15-diacetoxy-2-(α-methyl)-butanoyloxy-4α,6α-dihydroxy-8α-isobutanoyloxy-9-benzoxy--dihydroagarofuran], angulatin W [1,2-diacetoxy-4α,6α-dihydroxy-8-carbonyl-9-benzoxy-15-isobutanoyloxy--dihydroagarofuran], angulatin X [1,28α-triacetoxy-4α, 6α-dihydroxy-9-benzoxy-15-nicotinyl--dihydroagarofuran] (), together with one known compound Putterine B (), were isolated from the root bark of Maxim. The structures of compounds were elucidated by NMR, HRESIMS, IR data, and comparison with the literature data. The anti-inflammatory activity of all compounds was evaluated by measuring nitric oxide production in RAW264.7 macrophages. Compounds showed no significant nitric oxide inhibitory activity at 2.5 and 5 μM concentrations.