1 H - NMR ( CDCl 3 ) : 7 . 804 ( s , 1 H ) , 7 . 346 ~ 7 . 334 ( m , 5 H ) , 7 . 010 ( d , 1 H , J = 8 . 4 Hz ) , 6 . 826 ( s , 1 H ) , 6 . 536 ( d , 1 H , J = 8 Hz ) , 6 . 398 ( d , 1 H , J = 10 Hz ) , 5 . 472 ( d , 1 H , J = 10 Hz ) , 5 . 147 ( s , 2 H ) , 5 . 096 ( s , 2 H ) , 4 . 517 ( d , 2 H , J = 3 . 6 Hz ) , 3 . 327 ( br , 1 H ) , 2 . 293 ( s , 3 H ) , 2 . 233 ( s , 3 H ) , 1 . 367 ( s , 6 H )