1 H NMR ( 399 . 9 MHz , CDCl 3 ) δ 0 . 20 - 0 . 24 ( 2 H , m ) , 0 . 54 - 0 . 59 ( 2 H , m ) , 1 . 02 - 1 . 12 ( 1 H , m ) , 1 . 70 - 1 . 79 ( 2 H , m ) , 1 . 94 - 2 . 00 ( 2 H , m ) , 3 . 34 ( 2 H , d ) , 3 . 40 - 3 . 44 ( 2 H , m ) , 3 . 61 - 3 . 66 ( 1 H , m ) , 3 . 87 - 3 . 93 ( 2 H , m ) , 7 . 10 ( 1 H , d ) , 7 . 91 ( 1 H , d ) ; m / z = 342 [ M + H ] +.