1 H NMR ( 399 . 9 MHz , CDCl 3 ) δ 1 . 27 ( 3 H , d ) , 2 . 40 - 2 . 45 ( 5 H , m ) , 2 . 52 - 2 . 57 ( 2 H , m ) , 2 . 97 ( 4 H , m ) , 3 . 32 ( 1 H , q ) , 7 . 10 ( 2 H , d ) , 7 . 32 ( 2 H , d ) , 7 . 40 ( 2 H , d ) , 7 . 62 ( 2 H , d ) ; m / z = 423 / 425 [ M + H ] +.