1 H NMR ( 400 . 1 MHz , DMSO - d 6 ) δ 1 . 37 ( 2 H , ddd ) , 1 . 89 - 1 . 87 ( 2 H , m ) , 2 . 14 - 2 . 08 ( 1 H , m ) , 3 . 06 ( 2 H , t ) , 4 . 14 ( 2 H , d ) , 4 . 33 - 4 . 30 ( 2 H , m ) , 6 . 84 ( 1 H , d ) , 7 . 08 ( 1 H , d ) , 7 . 62 ( 1 H , d ) , 7 . 76 ( 1 H , t ) , 8 . 22 ( 1 H , d ) ; m / z = 413 [ M + H ] +.