1 H - NMR ( 300 MHz , CDCl 3 ) σ 1 . 08 ( t , 3 H , J = 7 . 0 Hz ) , 1 . 40 ( t , 3 H , J = 7 . 1 Hz ) , 1 . 71 ( d , 3 H , J = 6 . 2 Hz ) , 2 . 79 ( s , 3 H ) , 3 . 19 ( m , 2 H ) , 4 , 41 ( q , 2 H , J = 7 . 1 Hz ) , 5 . 47 ( q , 2 H , J = 6 . 2 Hz ) , 7 . 45 ( m , 5 H ) ;