444 8 . 83 ( 1 H , d ) , 8 . 38 ( 1 H , d ) , 8 . 30 - 8 . 21 ( 4 H , m ) , 8 . 10 - 8 . 06 ( 3 H , m ) , 7 . 98 ( 1 H , d ) , 7 . 89 ( 1 H , s ) , 7 . 81 - 7 . 78 ( 2 H , m ) , 7 . 60 - 7 . 35 ( 18 H , m )