The additional tertiary methyl group was located at C-8, as indicated by the fragment m/z 289 and m/z 221. An ion peak at m/z 275, which was formed by loss of the allylic methyl group at C-8, was also observed. Therefore, the structure of 2 is repre- sented by 28-O-[R-L-rhamopyranosyl(1f4)-O-â-D-glu- copyranosyl(1f6)-]-â-D-glucopyranoside of isoaleuritolic acid, which is new and named bodinitin B.