1 H - NMR ( CDCl 3 ) : 7 . 961 ( d , 1 H , J = 8 Hz ) , 7 . 245 ( d , 2 H , J = 8 . 8 Hz ) , 7 . 113 ( d , 2 H , J = 8 Hz ) , 7 . 007 ( d , 1 H , 8 . 4 Hz ) , 6 . 889 ( dd , 1 H , J = 8 , 1 . 2 Hz ) , 6 . 842 ( d , 1 H , J = 1 . 2 Hz ) , 6 . 539 ( dd , 1 H , J = 8 . 4 , 0 . 4 Hz ) , 6 . 392 ( dd , 1 H , J = 10 , 0 . 8 Hz ) , 5 . 466 ( d , 1 H , J = 9 . 6 Hz ) , 5 . 124 ( s , 2 H ) , 5 . 067 ( s , 2 H ) , 4 . 504 ( s , 2 H ) , 3 . 3 ( br , 1 H ) , 2 . 611 ( t , 2 H , J = 7 . 6 Hz ) , 2 . 347 ( s , 2 H ) , 1 . 679 ~ 1 . 622 ( m , 2 H ) , 1 . 369 ( s , 6 H ) , 0 . 938 ( t , 3 H , J = 7 . 2 Hz )