1 H NMR ( 399 . 9 MHz , CDCl 3 ) δ 1 . 38 ( 3 H , d ) , 2 . 48 - 2 . 54 ( 2 H , m ) , 2 . 59 - 2 . 64 ( 2 H , m ) , 3 . 43 ( 1 H , q ) , 3 . 54 - 3 . 62 ( 4 H , m ) , 6 . 99 - 7 . 05 ( 3 H , m ) , 7 . 12 ( 1 H , t ) , 7 . 28 - 7 . 31 ( 2 H , m ) , 7 . 88 ( 1 H , d ) ; m / z = 377 [ M + H ] +.