1 H - NMR ( CDCl 3 ) : 7 . 952 ( d , 1 H , J = 8 Hz ) , 7 . 380 ~ 7 . 314 ( m , 5 H ) , 6 . 901 ( d , 1 H , J = 8 Hz ) , 6 . 855 ( s , 1 H ) , 6 . 434 ( s , 1 H ) , 6 . 334 ( d , 1 H , J = 9 . 6 Hz ) , 5 . 410 ( d , 1 H , J = 10 Hz ) , 5 . 138 ( s , 2 H ) , 5 . 117 ( s , 2 H ) , 4 . 605 ( d , 2 H , J = 3 . 2 Hz ) , 3 . 050 ( br , 1 H ) , 2 . 656 ( q , 2 H , J = 15 . 2 , 7 . 6 Hz ) , 2 . 318 ( s , 3 H ) , 1 . 353 ( s , 6 H ) , 1 . 234 ( t , 3 H , J = 7 . 6 Hz )