... Phd 'H-NMR {dppm): d 5,54 (lU, s, H-12); 3,23 (IH, dd, J = 4,9; 11,2 Hz, H-3a); 2 ,75 (IH, td, J = 3,4; 11,2 Hz); 2,33 (IH, ch, J = 8,7; 4,8 Hz); 1,89 (IH, ch, J = ... va chi khac nhau d vi trf ndi ddi, dugc the hien qua cac tin hieu: (5H5,43, J^l 16,87; 145 ,75 ddi vdi chit cd ham lugng ldn hem (1) va (5^,5,20; 4-124,87; 140,00 ddi vdi chit cd ham ... 145,5 48,1 35,2 16,6 32,2 37,9 1* 37,31 24,07 79,66 38,16 50,85 23,08 116,87 145 ,75 48 66 35,62 17,28 31,46 38,12 "C-NMR la [8] 36,5 24,2 81,1 37,8 50,0 24,0...