1 H - NMR ( CDCl 3 ) δ 8 . 60 - 8 . 66 ( 1 H , m ) , 7 . 52 ( 1 H , d , J = 8 . 2 Hz ) , 7 . 46 ( 1 H , s ) , 7 . 17 - 7 . 39 ( 6 H , m ) , 4 . 54 - 4 . 68 ( 2 H , m ) , 3 . 53 - 3 . 60 ( 1 H , m ) , 3 . 41 ( 1 H , d , J = 13 . 0 Hz ) , 2 . 41 - 2 . 55 ( 2 H , m ) , 2 . 26 - 2 . 39 ( 1 H , m ) , 2 . 01 - 2 . 21 ( 1 H , m ) .