1 H NMR ( 400 MHz , CD 3 OD ) : δ 0 . 90 - 1 . 00 ( m , 3 H ) , 1 . 60 - 1 . 66 ( m , 2 H ) , 2 . 75 - 2 . 84 ( m , 1 H ) , 2 . 93 - 2 . 99 ( m , 1 H ) , 3 . 09 ( s , 2 H ) , 3 . 94 - 3 . 95 ( d , 2 H ) , 4 . 07 ( m , 1 H ) , 4 . 24 - 4 . 29 ( m , 2 H ) , 5 . 03 - 5 . 13 ( m , 2 H ) , 7 . 19 - 7 . 23 ( t , 1 H ) , 7 . 36 - 7 . 38 ( d , 1 H ) .