Ngày tải lên :
16/02/2016, 14:30
... (C-3), 179,5 (C-4), 163 ,0 (C-5), 99,9 (C-6), 165 ,9 (C-7), 94,8 (C-8), 159,0 (C-9), 105,7 (C-10), 122,7 (C-1′), 132,3 (C-2′), 116, 1 (C-3′), 161 ,5 (C-4′), 116, 1 (C-5′), 132,3 (C-6′), 104, 1 (C-1″), 75,7 ... (C-3), 179,4 (C-4), 162 ,9 (C-5), 100,0 (C-6), 166 ,4 (C-7), 94,8 (C-8), 158,8 (C-9), 104, 3 (C-10), 123,2 (C-1′), 115,9 (C-2′), 145,8 (C-3′), 149,9 (C-4′), 117,5 (C-5′), 123,0 (C-6′), 104, 4 (C-1″), 75,7 ... nhạt, mp 174-175oC, C16H16O4, ESI-MS m/z 273 [M+H]+ H-NMR (500 MHz, CDCl3), δ (ppm): 1,35 (3H, d, J=6,0 Hz, 3-CH3); 1,53 (3H, d, J=7,0 Hz, 1-CH3); 2,24 (1H, dd, J=10,1; 16, 0 Hz, 4-Hß); 2,71 (1H,...