1 H - NMR ( CDCl 3 ) : 7 . 967 ( d , 1 H , J = 8 Hz ) , 7 . 430 ~ 7 . 320 ( m , 5 H ) , 7 . 010 ( d , 1 H , J = 8 Hz ) , 6 . 998 ( d , 1 H , J = 8 Hz ) , 6 . 845 ( s , 1 H ) , 6 . 538 ( d , 1 H , J = 8 Hz ) , 6 . 387 ( d , 1 H , J = 10 Hz ) , 5 . 473 ( d , 1 H , J = 10 Hz ) , 5 . 163 ( s , 2 H ) , 5 . 153 ( s , 2 H ) , 4 . 514 ( s , 2 H ) , 3 . 389 ( s , 1 H ) , 2 . 611 ( t , 2 H , J = 7 . 6 Hz ) , 1 . 674 ~ 1 . 600 ( m , 2 H ) , 1 . 368 ( s , 6 H ) , 0 . 934 ( t , 3 H , J = 7 . 2 Hz )