1 H NMR ( 400 MHz , CDCl 3 ) : δ ppm : 5 . 78 ( ddt , J = 16 . 9 , 10 . 3 , 6 . 6 Hz , 1 H ) , 5 . 08 - 4 . 77 ( m , 2 H ) , 3 . 64 ( s , 3 H ) , 2 . 28 ( t , J = 7 . 5 Hz , 2 H ) , 2 . 01 ( q , J = 6 . 8 Hz , 2 H ) , 1 . 58 ( q , J = 7 . 0 Hz , 2 H ) , 1 . 40 - 1 . 19 ( m , 8 H )