1 H - NMR ( 200 MHz ; CDCl 3 ) ; δ 7 . 69 ( d , J = 7 . 4 Hz , IH ) , 6 . 21 ( m , 1 H ) , 5 . 70 ( d , J = 7 . 4 Hz , 1 H ) , 5 . 30 ( m , 2 H ) , 5 . 16 ( m , 1 H ) , 4 . 45 ( dd , J = 3 . 4 Hz , 12 . 3 Hz , 1 H ) , 4 . 16 - 4 . 28 ( m , 3 H ) , 2 . 34 ( t , J = 7 . 4 Hz , 2 H ) , 1 . 99 ( m , 4 H ) , 1 . 68 ( m , 2 H ) , 1 . 22 - 1 . 38 ( m , 22 H ) , 0 . 84 ( t , J = 6 . 4 Hz , 3 H ) .