1 H NMR ( 399 . 9 MHz , DMSO - d 6 ) δ 1 . 16 ( 3 H , d ) , 2 . 24 - 2 . 30 ( 1 H , m ) , 2 . 53 - 2 . 63 ( 1 H , m ) , 2 . 72 - 2 . 76 ( 1 H , m ) , 3 . 09 - 3 . 14 ( 1 H , m ) , 3 . 28 ? 3 . 32 ( 1 H + H 2 O , m ) , 3 . 35 ( 1 H , d ) , 3 . 84 - 3 . 89 ( 1 H , m ) , 3 . 92 - 4 . 00 ( 2 H , m ) , 7 . 36 - 7 . 39 ( 1 H , m ) , 7 . 61 ( 1 H , d ) , 7 . 74 - 7 . 77 ( 1 H , m ) , 8 . 25 ( 1 H , d ) , 8 . 47 - 8 . 49 ( 1 H , m ) , 8 . 54 ( 1 H , d ) ; m / z = 378 [ M + H ] +.