A new triterpene glycoside from Asterias rollentoni

A new triterpene glycoside, rollentoside A, has been isolated from Asterias rollentoni Bell and identified as 3 beta-O-{3-O-methyl-beta-D-xylopyranosyl-(1 -> 3)-O-beta-D-glucopyranosyl-(1 -> 4)-O-beta-D-quinopyranosyl(1 -> 2)-O-beta-D-xylopyranosyl}-16-beta-acetoxy-23S-acetoxy-holost-7-ene (1), together with a new natural product, rollentoside B (2). The structures of compounds 1 and 2 were elucidated by extensive 1D and 2D NMR investigation (H-1-H-1 COSY, TOCSY, HSQC, HMBC, NOESY).