1 H NMR ( 399 . 9 MHz , DMSO - d 6 ) δ 1 . 71 ( 2 H , m ) , 2 . 05 ( 2 H , m ) , 3 . 51 ( 2 H , m ) , 3 . 96 ( 2 H , m ) , 4 . 67 ( 1 H , m ) , 5 . 10 ( 2 H , s ) , 6 . 63 ( 3 H , m ) , 7 . 19 ( 1 H , m ) , 7 . 40 ( 5 H , m ) , 7 . 64 ( 1 H , d ) , 8 . 26 ( 1 H , d ) ; m / z = 470 [ M + H ] +.