1 H - NMR ( CDCl 3 ) : 7 . 961 ( d , 1 H , J = 8 Hz ) , 7 . 401 ( d , 1 H , J = 2 Hz ) , 7 . 366 ( d , 1 H , J = 8 Hz ) , 7 . 227 ( d , 1 H , 2 . 4 Hz ) , 7 . 206 ( d , 1 H , J = 2 Hz ) , 7 . 026 ( d , 1 H , 8 . 4 Hz ) , 6 . 933 ( dd , 1 H , J = 8 , 0 . 8 Hz ) , 6 . 804 ( s , 1 H ) , 6 . 556 ( d , 1 H , J = 8 . 4 Hz ) , 6 . 398 ( d , 1 H , J = 9 . 6 Hz ) , 5 . 504 ( d , 1 H , J = 10 Hz ) , 5 . 172 ( s , 2 H ) , 5 . 123 ( s , 2 H ) , 4 . 540 ( s , 2 H ) , 3 . 3 ( br , 1 H ) , 2 . 623 ( t , 2 H , J = 7 . 6 Hz ) , 1 . 684 ~ 1 . 610 ( m , 4 H ) , 1 . 382 ( s , 6 H ) , 0 . 944 ( t , 3 H , J = 7 . 2 Hz )