300 MHz ( CDCl 3 , ppm ) : 8 . 903 ( s , 1 H ) , 8 . 739 ( d , 3 H ) , 8 . 641 ( t , 2 H ) , 8 . 506 ( d , 1 H ) , 8 . 096 ( d , 1 H ) , 7 . 976 ( m , 3 H ) , 7 . 868 ( m , 2 H ) , 7 . 763 ( d , 1 H ) , 7 . 347 ~ 7 . 634 ( m , 13 H )