1 H NMR ( CDCl 3 ) δ 8 . 59 ( 1 H , dd , J = 4 . 9 , 1 . 2 Hz ) , 7 . 72 ( 1 H , dd , J = 7 . 9 , 1 . 2 Hz ) , 7 . 45 ( 1 H , d , J = 2 . 4 Hz ) , 7 . 41 - 7 . 22 ( 3 H , m ) , 7 . 14 ( 1 H , br ) , 4 . 80 ( 1 H , m ) , 4 . 70 ( 1 H , br ) , 4 . 62 - 4 . 49 ( 2 H , m ) , 4 . 24 - 4 . 17 ( 2 H , m ) , 3 . 95 - 3 . 89 ( 1 H , m ) , 3 . 42 - 3 . 36 ( 1 H , m ) , 3 . 07 - 2 . 66 ( 3 H , m ) , 2 . 43 - 2 . 30 ( 1 H , m ) .