1 H NMR ( 399 . 9 MHz , CDCl 3 ) δ 2 . 76 ( 4 H , s ) , 3 . 29 ( 2 H , d ) , 3 . 67 ( 2 H , s ) , 6 . 72 ( 1 H , t ) , 6 . 95 - 7 . 00 ( 1 H , m ) , 7 . 10 - 7 . 15 ( 2 H , m ) , 7 . 27 - 7 . 33 ( 1 H , m ) , 7 . 54 ( 1 H , d ) , 8 . 11 ( 1 H , d ) ; m / z = 376 [ M - H ] -.