1 H NMR ( 399 . 9 MHz , CDCl 3 ) δ 1 . 50 ( 9 H , s ) , 2 . 77 - 2 . 78 ( 2 H , m ) , 3 . 67 ( 2 H , t ) , 4 . 18 ( 2 H , q ) , 6 . 62 ( 1 H , s ) , 7 . 45 ( 1 H , d ) , 7 . 55 ( 1 H , d ) ; m / z = 240 [ M + H - 부틸렌 ] +.