Compound 3 had the molecular formula C48H76019 based on high-resolution FAB mass spectrometry.
The ‘H and 13C NMR spectra demonstrated that 3 had one B-glucuronopyranosyl and two p-glucopyranosyl moieties. On acid hydrolysis, glucuronic acid and glucose were identified in the hydrolysate. Comparison of the 13C NMR spectra of 3 with its aglycone showed glycosylation shifts for the signals due to C-2 and C-3, indicating that 3 was a 3-0-glycoside of oleanolic acid.