Complete assignments of 1H and 13C NMR resonances of oleanolic acid, 18α-oleanolic acid, ursolic acid and their 11-oxo derivatives

Complete assignments of H-1 and C-13 NMR chemical shifts for oleanolic acid, 18alpha-oleanolic acid, ursolic acid and their 11-oxo derivatives based on H-1, C-13, 2D DQF-COSY, NOESY, HSQC, HMBC and HSQC-TOCSY experiments were achieved. Copyright (C) 2003 John Wiley Sons, Ltd.