Ngày tải lên :
31/03/2015, 16:06
... H -13 ), 1, 33 (1H, m, H-6a), 1, 38 (1H, m, H-9), 1, 38 (1H, m, H -11 a), 1 , 41 (1H, m, H -15 b), 1 ,43 (1H, m, H -12 a), 1 ,45 (1H, m, H -17 ), 1 ,47 (1H, m, H-7b), 1 ,49 (1H, m, H -12 b), 1 ,49 (1H, m, H-20a), 1, 53 ... (3H, s, 4- CH3), 1, 09 (3H, s, 4- CH3), 1, 1 (1H, m, H-22a), 1, 17 (1H, m, H7b), 1, 17 (1H, m, H -11 a), 1, 18 (1H, m, H-22a), 1, 31 (1H, m, H -16 a), 1, 31 (2H, m, H2 -15 ), 1, 36 46 (1H, m, H-7a), 1 ,44 (1H, m, ... axetat 1: 1, v/v) 47 IR: νmax (film) cm 1: 3367, 2 919 , 2 843 , 16 03, 15 35, 15 12, 14 4 2, 13 75, 12 20, 10 76, 10 24 EI-MS: m/z 3 14 (%) (M+·, C19H22O4, 3 ,4) , 19 0 (5,6), 17 6 (5,3), 14 9 (13 ,4) , 10 7 (10 0),...