1 H - NMR ( CDCl 3 ) : 7 . 980 ( d , 1 H , J = 8 . 4 Hz ) , 7 . 388 ~ 7 . 322 ( m , 5 H ) , 7 . 012 ( d , 1 H , J = 8 . 4 Hz ) , 6 . 950 ( dd , 1 H , J = 8 , 1 . 2 Hz ) , 6 . 889 ( s , 1 H ) , 6 . 540 ( d , 1 H , J = 8 Hz ) , 6 . 393 ( d , 1 H , J = 9 . 6 Hz ) , 5 . 478 ( d , 1 H , J = 10 Hz ) , 5 . 155 ( s , 2 H ) , 5 . 138 ( s , 2 H ) , 4 . 519 ( d , 2 H , J = 4 . 8 Hz ) , 3 . 381 ( br , 1 H ) , 2 . 928 ( m , 1 H ) , 1 . 400 ( s , 6 H ) , 1 . 261 ~ 1 . 215 ( m , 6 H )