1 H NMR ( 400 MHz , CDCl 3 ) δ 7 . 39 - 7 . 31 ( m , 5 H ) , 6 . 70 - 6 . 91 ( m , 1 H ) , 6 . 77 ( d , J = 2 . 4 Hz , 1 H ) , 6 . 65 - 6 . 61 ( m , 1 H ) , 5 . 18 - 5 . 13 ( m , 2 H ) , 4 . 36 ( br d , J = 42 . 0 Hz , 1 H ) , 3 . 94 - 3 . 83 ( m , 1 H ) , 3 . 12 - 3 . 03 ( m , 1 H ) , 2 . 72 - 2 . 57 ( m , 2 H ) , 2 . 32 ( d , J = 11 . 2 Hz , 1 H ) , 1 . 71 - 1 . 24 ( m , 9 H ) , 1 . 11 - 1 . 02 ( m , 1 H ) .