1 H - NMR ( 300 MHz , CDCl 3 ) σ 1 . 09 ( t , 3 H , J = 7 . 2 Hz ) , 1 . 41 ( t , 3 H , J = 7 . 2 Hz ) , 1 . 70 ( d , 3 H , J = 6 . 3 Hz ) , 2 . 79 ( s , 3 H ) , 3 . 18 ( q , 2 H , J = 7 . 2 Hz ) , 4 . 40 ( q , 2 H , J = 7 . 2 Hz ) , 5 . 24 ( q , 1 H , J = 6 . 3 Hz ) , 7 . 10 - 7 . 17 ( m , 2 H ) , 7 . 25 ( m , 1 H ) ;