1 H - NMR ( 300 MHz , CDCl 3 ) σ 1 . 05 ( t , 3 H , J = 6 . 9 Hz ) , 1 . 39 ( t , 3 H , J = 6 . 9 Hz ) , 1 . 65 ( d , 3 H , J = 5 . 4 Hz ) , 2 . 78 ( s , 3 H ) , 3 . 13 ( m , 2 H ) , 3 . 76 ( s , 3 H ) , 4 . 40 ( q , 2 H , J = 6 . 9 Hz ) , 5 . 14 ( q , 1 H , J = 5 . 4 Hz ) , 6 . 93 ( d , 1 H , J = 8 . 4 Hz ) , 7 . 02 ( dd , 1 H , J = 7 . 5 , 7 . 5 Hz ) , 7 . 39 - 7 . 46 ( m , 2 H ) ;