The identity glucose units of 1 were determined by comparison of the 13C NMR data ( Table 1) with the corresponding monosaccharides, 26 which was further confirmed by the Co-Tlc comparison with an authentic sample of d-glucose. To determine the absolute configuration, 1 was subjected to acidic hydrolysis, followed by GC analysis in comparison with d-glucose, using a literature method. 27 On the basis of these evidence, the structure of 1 was established as ursan-3β,19α,22β-triol-3-O-β-d-glucopyranosyl (2′→1″)-β-d-glucopyranoside.