1 H - NMR ( CDCl 3 ) : 8 . 059 ( d , 1 H , J = 8 . 8 Hz ) , 7 . 355 ~ 7 . 324 ( m , 5 H ) , 7 . 006 ( d , 1 H , J = 8 Hz ) , 6 . 589 ( dd , 1 H , J = 8 , 2 Hz ) , 6 . 529 ( d , 1 H , J = 8 Hz ) , 6 . 505 ( d , 1 H , J = 2 Hz ) , 6 . 375 ( d , 1 H , J = 10 Hz ) , 5 . 458 ( d , 1 H , J = 10 Hz ) , 5 . 125 ( s , 2 H ) , 5 . 091 ( s , 2 H ) , 4 . 519 ( s , 2 H ) , 3 . 995 ( t , 2 H , J = 6 . 4 Hz ) , 3 . 544 ( br , 1 H ) , 1 . 805 ~ 1 . 752 ( m , 2 H ) , 1 . 455 ~ 1 . 388 ( m , 4 H ) , 1 . 365 ( s , 6 H ) , 0 . 935 ( t , 3 H , J = 6 . 8 Hz )