Terpenoids from the roots of Alangium chinense
Two new norditerpenoids (1 and 2), four new sesquiterpenoids (3–6), and 22 known compounds (7–28) were isolated from an ethanolic extract of roots of Alangium chinense. The absolute configurations of 1–6 were assigned by experimental and calculated ECD spectra. The skeleton of the compounds (1 and 2) has been reported only one time so far. Compounds 1, 13, and 23 exhibited antiviral activity against coxsackie virus B3 with IC50 values of 38–67 μM. Compounds 8 and 9 displayed neuritis inhibitory activity against microglial inflammation factor, with IC50 values of 6.4 and 10.1 μM, respectively. None of the compounds were cytotoxic in the MTT assay.