1 H NMR ( 300 MHz , CDCl 3 ) δ 1 . 79 - 2 . 01 ( 3 H , m ) , 2 . 05 - 2 . 24 ( 1 H , m ) , 3 . 30 ( 2 H , t , J = 6 . 4 Hz ) , 3 . 49 ( 2 H , q , J = 6 . 4 Hz ) , 3 . 87 - 4 . 05 ( 3 H , m ) , 7 . 27 - 7 . 32 ( 2 H , m ) , 7 . 59 ( 2 H , d , J = 8 . 3 Hz ) .