1 H NMR ( 300 MHz , DMSO - d 6 + D 2 O ) δ 8 . 98 ( s , 1 H ) , 8 . 75 ( s , 1 H ) , 8 . 46 ( br s , 1 H ) , 8 . 37 ( m , 1 H ) , 7 . 87 ( br d , 2 H , J = 8 . 7 Hz ) , 7 . 70 ( m , 1 H ) , 7 . 59 ( br d , 2 H , J = 8 . 7 Hz ) , 7 . 44 ( br d , 2 H , J = 9 . 0 Hz ) , 7 . 31 ( m , 3 H ) , 7 . 07 ( br t , 1 H , J = 7 . 4 Hz ) , 6 . 94 ( m , 4 H ) , 3 . 31 ( br t , 2 H , J = 7 . 3 Hz ) , 3 . 12 ( br t , 2 H , J = 7 . 2 Hz ) ; MS ( m / z ) : 477 ( M +).