1 H - NMR ( CDCl 3 ) : 8 . 033 ( d , 1 H , J = 8 Hz ) , 6 . 581 ~ 6 . 537 ( m , 2 H ) , 6 . 458 ( s , 1 H ) , 6 . 405 ( d , 1 H , J = 2 Hz ) , 6 . 068 ~ 5 . 999 ( m , 1 H ) , 5 . 583 ( d , 1 H , J = 10 Hz ) , 5 . 389 ( dd , 1 H , J = 18 . 8 , 1 . 2 Hz ) , 5 . 296 ( dd , 1 H , J = 10 . 4 , 1 . 2 Hz ) , 5 . 208 ( s , 2 H ) , 4 . 724 ( s , 2 H ) , 4 . 579 ( d , 2 H , J = 5 . 6 Hz ) , 4 . 079 ( q , 2 H , J = 14 , 7 . 2 Hz ) , 3 . 683 ( br , 1 H ) , 2 . 350 ( s , 3 H ) , 1 . 447 ~ 1 . 413 ( m , 9 H )