1 H NMR ( 300 MHz , DMSO - d 6 ) δ : 9 . 97 ( br s , 1 H ) , 8 . 25 ( d , J = 8 . 4 Hz , 1 H ) , 7 . 61 - 7 . 45 ( m , 7 H ) , 7 . 39 - 7 . 34 ( m , 1 H ) , 6 . 88 ( s , 1 H ) , 4 . 36 ( q , J = 7 . 0 Hz , 2 H ) , 1 . 41 ( t , J = 7 . 0 Hz , 3 H ) .