1 H - NMR ( CDCl 3 ) : 7 . 964 ( d , 1 H , J = 7 . 6 Hz ) , 7 . 249 ( d , 1 H , J = 9 . 6 Hz ) , 7 . 118 ( d , 2 H , J = 8 Hz ) , 7 . 010 ( d , 1 H , J = 8 Hz ) , 6 . 895 ( d , 1 H , J = 8 Hz 0 , 6 . 842 ( s , 1 H ) , 6 . 541 ( d , 1 H , J = 8 Hz ) , 6 . 391 ( d , 1 H , J = 10 Hz ) , 5 . 468 ( d , 1 H , J = 9 . 6 Hz ) , 5 . 125 ( s , 2 H ) , 5 . 070 ( s , 2 H ) , 4 . 505 ( d , 2 H , J = 6 . 4 Hz ) , 3 . 243 ( t , 1 H , J = 6 . 4 Hz ) , 2 . 614 ( t , 2 H , J = 7 . 6 Hz ) , 2 . 351 ( s , 3 H ) , 1 . 681 ~ 1 . 603 ( m , 2 H ) , 1 . 371 ( s , 6 H ) , 0 . 941 ( t , 3 H , J = 7 . 6 Hz )