1 H NMR ( 499 . 8 MHz , DMSO - d 6 ) δ 1 . 64 - 1 . 90 ( 4 H , m ) , 1 . 98 - 2 . 09 ( 2 H , m ) , 2 . 68 ( 1 H , t ) , 3 . 59 - 3 . 75 ( 2 H , m ) , 3 . 76 - 3 . 86 ( 1 H , m ) , 3 . 87 - 3 . 96 ( 1 H , m ) , 7 . 10 - 7 . 20 ( 3 H , m ) , 7 . 24 ( 2 H , t ) , 7 . 49 ( 1 H , d ) , 8 . 20 ( 1 H , d ) ; m / z = 378 [ M + H ] +.