1 H NMR ( 399 . 9 MHz , CDCl 3 ) δ 1 . 72 - 1 . 79 ( 2 H , m ) , 1 . 96 - 2 . 00 ( 2 H , m ) , 2 . 70 - 2 . 73 ( 1 H , m ) , 3 . 06 - 3 . 14 ( 2 H , m ) , 3 . 60 ( 2 H , s ) , 4 . 33 - 4 . 38 ( 2 H , m ) , 6 . 65 ( 2 H , d ) , 7 . 01 ( 2 H , d ) , 7 . 12 ( 1 H , d ) , 7 . 91 ( 1 H , d ) ; m / z = 363 [ M + H ] +.