1 H NMR ( 399 . 9 MHz , CDCl 3 ) δ 1 . 32 - 1 . 43 ( 2 H , m ) , 1 . 93 ( 2 H , d ) , 1 . 98 - 2 . 02 ( 1 H , m ) , 2 . 96 ( 3 H , s ) , 3 . 00 ( 3 H , s ) , 3 . 03 - 3 . 07 ( 2 H , m ) , 3 . 41 - 3 . 43 ( 2 H , m ) , 4 . 15 ( 2 H , s ) , 4 . 25 ( 2 H , d ) , 7 . 09 ( 1 H , d ) , 7 . 90 ( 1 H , d ) ; m / z = 387 [ M + H ] +.