1 H NMR ( CD 3 OD ) δ : 8 . 78 ( s , 1 H ) , 7 . 48 - 7 . 54 ( d , 2 H ) , 7 . 33 - 7 . 38 ( m , 4 H ) , 7 . 26 - 7 . 27 ( m , 1 H ) , 4 . 62 ( s , 1 H ) , 4 . 32 ( s , 1 H ) , 3 . 89 ( s , 4 H ) , 3 . 72 - 3 . 78 ( m , 1 H ) , 2 . 87 ( s , 3 H ) , 2 . 78 - 2 . 80 ( m , 1 H ) , 1 . 49 - 1 . 53 ( m , 1 H ) , 3 . 1 - 1 . 38 ( m , 3 H ) , 0 . 99 - 1 . 23 ( m , 4 H )