1 H NMR ( CD 3 OD ) δ : 7 . 68 ( s , 1 H ) , 7 . 21 - 7 . 52 ( m , 6 H ) , 4 . 90 ( bs , 1 H ) , 4 . 20 ( s , 2 H ) , 3 . 90 ( s , 3 H ) , 3 . 45 - 3 . 50 ( m , 2 H ) , 3 . 00 ( m , 1 H ) , 2 . 81 - 2 . 83 ( m , 6 H ) , 2 . 15 - 2 . 17 ( m , 2 H ) , 1 . 41 - 1 . 69 ( m , 6 H ) , 1 . 19 - 1 . 22 ( m , 2 H ) .