1 H NMR ( 300 MHz , CDCl 3 ) δ . 38 - 8 . 438 ( m , 2 H ) , 7 . 66 ( s , 1 H ) , 7 . 43 ( s , 5 H ) , 5 . 10 ( s , 2 H ) , 4 . 51 ( q , J = 7 . 2 Hz , 2 H ) , 1 . 86 ( s , 3 H ) , 1 . 47 ( t , J = 7 . 2 Hz , 3 H ) .