1 H NMR ( 399 . 9 MHz , CDCl 3 ) δ 4 . 17 - 4 . 21 ( 2 H , m ) , 4 . 50 - 4 . 54 ( 2 H , m ) , 5 . 05 - 5 . 10 ( 1 H , m ) , 6 . 44 - 6 . 47 ( 1 H , m ) , 6 . 50 - 6 . 52 ( 1 H , m ) , 6 . 60 ( 1 H , d ) , 6 . 66 - 6 . 71 ( 1 H , m ) , 7 . 18 - 7 . 24 ( 1 H , m ) , 7 . 88 ( 1 H , d ) ; m / z = 354 [ M + H ] +.