1 H NMR ( 400 MHz , CD 3 OD ) δ 8 . 55 ( d , J = 1 . 2 Hz , 1 H ) , 8 . 51 ( s , 1 H ) , 7 . 90 ( d , J = 8 . 8 Hz , 1 H ) , 7 . 60 ( dd , J = 8 . 5 , 1 . 8 Hz , 1 H ) , 3 . 92 - 4 . 00 ( m , 1 H ) , 3 . 58 - 3 . 69 ( m , 1 H ) , 3 . 39 - 3 . 50 ( m , 2 H ) , 1 . 78 - 1 . 94 ( m , 2 H ) , 1 . 56 - 1 . 69 ( m , 1 H ) , 1 . 29 - 1 . 40 ( m , 1 H ) , 1 . 17 ( d , J = 6 . 0 Hz , 3 H ) .