1 H NMR ( 300 MHz , CDCl 3 ) δ 7 . 04 ( d , J = 8 . 4 Hz , 1 H ) , 6 . 93 ( s , 1 H ) , 6 . 86 ( d , J = 8 . 4 Hz , 1 H ) , 5 . 76 - 5 . 69 ( m , 2 H ) , 4 . 65 - 4 . 61 ( m , 1 H ) , 3 . 19 - 3 . 07 ( m , 2 H ) , 2 . 76 - 2 . 65 ( m , 4 H ) , 2 . 28 ( d , J = 12 . 9 Hz , 1 H ) , 1 . 75 - 1 . 64 ( m , 8 H ) , 1 . 51 - 1 . 13 ( m , 15 H ) , 1 . 11 - 0 . 93 ( m , 2 H ) .