1 H - NMR ( CDCl 3 ) : 8 . 153 ( s , 1 H ) , 7 . 899 ~ 7 . 305 ( m , 5 H ) , 7 . 101 ( d , 1 H , J = 8 . 4 Hz ) , 6 . 902 ( s , 1 H ) , 6 . 537 ( d , 1 H , J = 8 . 4 Hz ) , 6 . 385 ( d , 1 H , J = 9 . 6 Hz ) , 5 . 487 ( d , 1 H , J = 10 Hz ) , 5 . 111 ( s , 4 H ) , 4 . 479 ( s , 2 H ) , 3 . 15 ( br , 1 H ) , 2 . 741 ( q , 2 H ) , 1 . 366 ( s , 6 H ) , 1 . 213 ( t , 3 H )