1 H NMR ( 300 . 1 MHz , DMSO - d 6 ) δ 1 . 26 ( 3 H , d ) , 2 . 06 - 2 . 19 ( 1 H , m ) , 2 . 22 - 2 . 30 ( 1 H , m ) , 2 . 75 ( 1 H , d ) , 2 . 94 ( 1 H , d ) , 3 . 14 - 3 . 27 ( 1 H , m ) , 3 . 53 ( 2 H , q ) , 4 . 04 ( 1 H , d ) , 4 . 41 - 4 . 53 ( 1 H , m ) , 7 . 23 - 7 . 39 ( 5 H , m ) , 7 . 56 ( 1 H , d ) , 8 . 24 ( 1 H , d ) ; m / z = 393 [ M + H ] +.