Two New Monoterpene Peroxide Glycosides from Aster scaber

led to the monoterpene structure 3-hydroxy-7-hydroperoxy3,7-dimethylocta-1,5-diene. The relationship of the two angeloyl groups, the glucose, and the monoterpene moiety was established by the analysis of the 1 H‐ 1 H COSY, HMQC and HMBC spectra. In the HMBC spectrum, long-range connectivities were observed between the H-39 (d 5.29) and the angeloyl ester carbons C-10 (d 168.5), the H-49 protons (d 5.09) and C-1- (d 167.6), and the anomeric H-19 proton (d 4.56) and the C-3 carbon (d 80.8), respectively. Thus, the gross structure of 1 was suggested to be 3-O-(39,49-diangeloyl-b-D-glucopyranosyloxy)-7-hydroperoxy-3,7-dimethylocta-1,5-diene.