1 H NMR ( 600 MHz , CDCl 3 ) δ = 7 . 38 ( d , J = 9 Hz , 1 H ) , 7 . 34 ( d , J = 4 . 2 Hz , 1 H ) , 6 . 98 ( t , J = 6 Hz , 1 H ) , 6 . 95 ( d , J = 1 . 2 Hz , 1 H ) , 6 . 93 ( d , J = 9 Hz , 2 H ) , 6 . 86 ( d , J = 4 . 2 Hz , 1 H ) , 4 . 88 - 4 . 82 ( m , 1 H ) , 4 . 12 - 4 . 05 ( m , 3 H ) , 4 . 05 - 3 . 99 ( m , 2 H ) , 3 . 89 - 3 . 82 ( m , 2 H ) , 3 . 73 ( dt , J = 15 , 6 Hz , 1 H ) , 2 . 32 ( s , 3 H )