One unusual secoiridoid trimer, namely sweriyunnanlactone A (1), was isolated from Swertia yunnanensis under the guidance of LC-MS analysis. Sweriyunnanlactone A with a phenyl ring (ring F) was the first example of secoiridoid trimer featuring a C-28 skeleton. Its structure was determined by extensive HRESIMS, 1D and 2D NMR spectroscopic data, and GIAO C-13 NMR calculation. Compound 1 showed weak inhibition on HBV DNA replication with an IC50 value of 60.76 mu M (SI = 12.6) on HepG 2.2.15 cell line in vitro. (C) 2015 Elsevier Ltd. All rights reserved.
B VIRUS ACTIVITY