Two new sesquiterpenes from Ainsliaea glabra

Two new sesquiterpenes (1 and 2) together with seven known compounds (3–9) were isolated from the whole plant of Ainsliaea glabra Hemsl. The chemical structures were established elucidated by extensive spectroscopic analysis and comparison with the literature. All compound were tested for antimicrobial activity. Compound 8 exhibited anti-bacterial activity against Staphylococcus aureus with a MIC value of 25.0 μg/mL.