1 H NMR ( CDCl 3 ) δ 8 . 57 - 8 . 54 ( 1 H , m ) , 7 . 63 ( 1 H , br d , J = 7 . 9 , 1 . 8 Hz ) , 7 . 39 ( 1 H , d , J = 1 . 8 Hz ) , 7 . 33 ( 1 H , dd , J = 7 . 9 , 4 . 9 Hz ) , 7 . 20 - 7 . 11 ( 2 H , m ) , 7 . 03 ( 1 H , br ) , 4 . 90 ( 1 H , br ) , 3 . 99 ( 1 H , d , J = 11 . 6 Hz ) , 3 . 74 ( 1 H , br ) , 3 . 70 ( 1 H , d , J = 11 . 6 Hz ) , 3 . 08 ( 1 H , m ) , 2 . 90 ( 1 H , m ) , 2 . 3 - 2 . 01 ( 4 H , m ) , 1 . 42 - 1 . 29 ( 2 H , m ) .