... '''C-NMR cho tha'y CH-1 gdm hai triterpen kha gid'ng nhau, diu cd mdt nhdm hydroxy {S^^3,25•, 5(19,1) va chi khac nhau d vi trf ndi ddi, dugc the hien qua cac tin hieu: (5H5,43, ... cho mdt vet trdn tren sic ky ldp mdng ngay ci khi chay lap lai 3 lin bing cac he dung mdi khac nhau va khdng the tach tie'p bing sic ky cot. Tuy nhien, phd 'H-NMR cho biet thanh phin ... cho mdt vet trdn tren sic ky ldp mdng ngay ca khi chay lap lai 3 lin vdi cac he dung mdi khac nhau va khdng the tach tilp bing sic ky cdt nhilu lin. Tuy nhien phd 'H-NMR cho biet thanh...