Chemical investigation of the aqueous extract from the aerial part of Sibiraea angustata, has led to the isolation of eight new monoterpene acylglucosides named sibiraglycoside A-H(1-8), together with two known monoterpenes, Sibiraic acid (9) and Sibiskoside (10). Their structures were elucidated by means of extensive spectroscopic data analysis (including 1D and 2D NMR, HRESIMS experiments), as well as compared with the literature data. The relative configuration was established by NOE studies. In the in vitro bioassay, all the compounds showed moderate hypolipemic effects, among them, compounds 7 and 9, showed distinctive activity on lowering lipid.
Keywords: Sibiraea angustata; hypolipemic effect; monoterpene acylglucoside; sibiraglycoside A-H.