1 H NMR ( 400 MHz , CDCl 3 ) δ 8 . 53 ( br , 1 H ) , 7 . 95 ( br , 1 H ) , 7 . 12 ( d , J = 8 . 4 Hz , 1 H ) , 6 . 96 ( d , J = 2 . 4 Hz , 1 H ) , 6 . 92 ( dd , J = 8 . 4 , 2 . 4 Hz , 1 H ) , 5 . 77 및 5 . 74 ( AB q , J = 6 . 8 Hz , 2 H ) , 3 . 74 ( br , 1 H ) , 3 . 26 - 3 . 17 ( m , 2 H ) , 3 . 08 ( br d , J = 19 . 2 Hz , 1 H ) , 2 . 79 ( br , 1 H ) , 2 . 45 - 2 . 34 ( m , 2 H ) , 2 . 06 - 2 . 01 ( m , 1 H ) , 1 . 95 - 1 . 89 ( m , 1 H ) , 1 . 71 - 1 . 39 ( m , 8 H ) , 1 . 29 - 1 . 23 ( m , 1 H ) , 1 . 14 ( d , J = 6 . 8 Hz , 3 H ) , 1 . 08 - 1 . 01 ( m , 1 H ) , 0 . 86 ( t , J = 7 . 6 Hz , 3 H ) .