1 H - NMR ( 300 MHz , CDCl 3 ) σ 1 . 11 ( t , 3 H , J = 7 . 1 Hz ) , 1 . 41 ( t , 3 H , J = 7 . 2 Hz ) , 1 . 72 ( d , 3 H , J = 6 . 1 Hz ) , 2 . 79 ( s , 3 H ) , 3 . 22 ( q , 2 H , J = 7 . 1 Hz ) , 4 . 40 ( q , 2 H , J = 7 . 2 Hz ) , 5 . 47 ( q , 1 H , J = 6 . 1 Hz ) , 7 . 35 - 7 . 53 ( m , 3 H ) , 7 . 55 ( d , 1 H , J = 1 . 8 Hz ) ;