1 H NMR ( 300 MHz , CDCl 3 ) δ 1 . 81 - 2 . 03 ( 3 H , m ) , 2 . 10 - 2 . 22 ( 1 H , m ) , 3 . 27 - 3 . 34 ( 2 H , m ) , 3 . 41 - 3 . 56 ( 2 H , m ) , 3 . 86 - 4 . 02 ( 3 H , m ) , 7 . 24 ( 2 H , d , J = 8 . 3 Hz ) , 7 . 28 - 7 . 36 ( 2 H , m ) , 7 . 39 - 7 . 53 ( 3 H , m ) .