Complete assignment of 1H and 13C NMR spectra of new pentacyclic triterpene acid benzyl esters

Complete assignments of H-1 and C-13 NMR chemical shifts for newly synthesized benzyl esters of oleanolic, ursolic and crataegolic acid based on DEPT, HSQC, HMBC, COSY, TOCSY, NOE and ROESY experiments are reported. Copyright (C) 2002 John Wiley Sons, Ltd.