1 H NMR ( 300 MHz , DMSO - d 6 ) δ : 10 . 33 ( br s , 1 H ) , 8 . 24 ( d , J = 8 . 3 Hz , 1 H ) , 7 . 57 - 7 . 50 ( m , 4 H ) , 7 . 38 - 7 . 34 ( m , 3 H ) , 7 . 30 - 7 . 27 ( m , 1 H ) , 7 . 02 ( s , 1 H ) , 3 . 58 ( q , J = 7 . 1 Hz , 2 H ) , 1 . 10 ( t , J = 7 . 1 Hz , 3 H ) .