1 H NMR ( 400 MHz , CD 3 OD ) : δ 7 . 38 ( m , 1 H ) , 7 . 25 ( m , 1 H ) , 6 . 96 ( m , 1 H ) , 5 . 10 ( m , 2 H ) , 4 . 88 ( m , 1 H ) , 4 . 33 ( m , 2 H ) , 4 . 11 ( m , 2 H ) , 3 . 95 ( m , 2 H ) , 3 . 05 ( m , 2 H ) , 3 . 00 ( m , 1 H ) , 2 . 85 ( m , 1 H ) , 2 . 03 ( m , 3 H ) , 1 . 64 ( m , 3 H ) .