1 H NMR ( 300 MHz , DMSO - d 6 ) δ : 8 . 05 ( d , J = 7 . 7 Hz , 1 H ) , 7 . 84 - 7 . 74 ( m , 5 H ) , 7 . 60 ( t , J = 7 . 6 Hz , 1 H ) , 7 . 46 ( t , J = 7 . 8 Hz , 1 H ) , 6 . 57 ( d , J = 7 . 9 Hz , 1 H ) , 3 . 60 ( q , J = 7 . 0 Hz , 2 H ) , 0 . 98 ( t , J = 7 . 0 Hz , 3 H ) .