1 H NMR ( 400 MHz , CD 3 OD ) δ = 9 . 05 ( s , 1 H ) , 8 . 33 ( s , 1 H ) , 8 . 25 ( s , 1 H ) , 8 . 12 ( s , 1 H ) , 6 . 34 ( br s , 2 H ) , 5 . 88 ( br s , 2 H ) , 5 . 66 ( br d , J = 51 . 6 Hz , 1 H ) , 5 . 59 ( br d , J = 52 . 2 Hz , 1 H ) 5 . 01 ( br s , 2 H ) , 4 . 68 - 4 . 34 ( m , 6 H ) , 4 . 07 - 3 . 82 ( m , 2 H ) , 3 . 79 - 3 . 55 ( m , 2 H ) ;