Structure determination and detailed1H,13C NMR assignments of triterpenes fromMimusops elengi

The seeds of Mimusops elengi yielded a new triterpene, mimusic acid, whose structure was elucidated as 2β,3β,16α,23-tetrahydroxyoleana-5,13(18)-dien-28-oic acid by NMR spectral studies. The detailed 1H and 13C NMR resonance assignments of this compound and of the previously reported congener mimusopic acid were achieved by using the 2D NMR techniques, HETCOR, COSY, NOESY and HMBC.