1 H NMR ( 400 MHz , CDCl 3 ) δ 8 . 54 ( br , 1 H ) , 7 . 52 ( br , 1 H ) , 7 . 27 - 7 . 24 ( m , 5 H ) , 7 . 03 ( dd , J = 8 . 4 , 2 . 4 Hz , 1 H ) , 6 . 85 ( dd , J = 9 . 2 , 2 . 4 Hz , 1 H ) , 6 . 78 - 6 . 74 ( m , 1 H ) , 5 . 74 - 5 . 68 ( m , 2 H ) , 3 . 71 ( br , 1 H ) , 3 . 48 ( t , J = 7 . 6 Hz , 1 H ) , 3 . 21 - 3 . 13 ( m , 2 H ) , 3 . 03 ( d , J = 19 . 2 Hz , 1 H ) , 2 . 74 ( br , 1 H ) , 2 . 28 - 2 . 23 ( m , 1 H ) , 2 . 16 - 1 . 99 ( m , 2 H ) , 1 . 92 - 1 . 75 ( m , 2 H ) , 1 . 67 ( d , J = 11 . 2 Hz , 1 H ) , 1 . 54 - 1 . 35 ( m , 4 H ) , 1 . 27 - 1 . 16 ( m , 1 H ) , 1 . 04 - 0 . 96 ( m , 2 H ) , 0 . 88 - 0 . 74 ( m , 3 H ) .