1 H NMR ( 399 . 9 MHz , CDCl 3 ) δ 1 . 09 - 1 . 11 ( 3 H , m ) , 1 . 33 ( 3 H , d ) , 2 . 36 - 2 . 40 ( 1 H , m ) , 2 . 88 - 2 . 95 ( 1 H , m ) , 3 . 15 - 3 . 18 ( 1 H , m ) , 3 . 53 - 3 . 59 ( 2 H , m ) , 3 . 69 ( 1 H , d ) , 3 . 84 ( 1 H , d ) , 4 . 31 ( 1 H , s ) , 7 . 03 ( 1 H , d ) , 7 . 28 - 7 . 30 ( 1 H , m ) , 7 . 71 - 7 . 74 ( 1 H , m ) , 7 . 91 ( 1 H , d ) , 8 . 52 - 8 . 54 ( 1 H , m ) , 8 . 60 ( 1 H , d ) ; m / z = 392 [ M + H ] +.