1 H - NMR ( 300 MHz , CDCl 3 ) σ 1 . 08 ( t , 3 H , J = 6 . 9 Hz ) , 1 . 40 ( t , 3 H , J = 7 . 2 Hz ) , 1 . 70 ( d , 3 H , J = 6 . 3 Hz ) , 2 . 77 ( s , 3 H ) , 3 . 20 ( m , 2 H ) , 3 . 85 ( s , 3 H ) , 4 . 38 ( q , 2 H , J = 7 . 2 Hz ) , 5 . 46 ( q , 1 H , J = 6 . 3 Hz ) , 6 . 95 ( dd , 2 H , J = 2 . 1 , 7 . 2 Hz ) , 7 . 40 ( dd , 2 H , J = 2 . 1 , 7 . 2 Hz ) ;