Sesquiterpenoid tropolone glycosides from Liriosma ovata.

Two new sesquiterpenoid tropolone glycosides, liriosmasides A (1) and B (2), along with two known compounds, secoxyloganin and oplopanpheside C, were isolated from a methanol extract of the roots of Liriosma ovata. The structures of 1 and 2 were elucidated by spectroscopic methods including 1D and 2D NMR and by high-resolution mass spectrometry involving an ultra-high-performance liquid chromatography–quadrupole-orbital ion trap mass spectrometric (UHPLC–Q-Orbitrap MS) method. Compound 1 showed weak inhibitory activity against HIV RNase H.