Two new sesquiterpenes (1-2) and six known analogues (3-8) were isolated from the branches and leaves of Xylopia vielana Pierre. The structures of the new compounds were identified by analyzing 1 D and 2 D NMR data and HRESIMS data, combined with induced and calculated circular dichroism experiments. In addition, compounds 1-4, 7 and 8 showed notable nitric oxide (NO) inhibitory effects (IC50 < 10 μM) on the model of the lipopolysaccharide (LPS)-activated RAW 264.7 macrophages.
Keywords: NO inhibitory effects; Xylopia vielana; sesquiterpenes.