1 H NMR ( 400 MHz , CD 3 OD ) : δ 7 . 45 - 7 . 38 ( m , 1 H ) , 7 . 27 - 7 . 23 ( m , 1 H ) , 5 . 10 - 5 . 05 ( m , 2 H ) , 4 . 35 - 4 . 28 ( m , 2 H ) , 4 . 10 - 4 . 09 ( m , 1 H ) , 4 . 00 - 3 . 95 ( m , 2 H ) , 3 . 68 - 3 . 56 ( m , 4 H ) , 3 . 35 - 3 . 24 ( m , 4 H ) , 3 . 13 ( m , 2 H ) , 3 . 00 - 2 . 88 ( m , 5 H ) .