1 H NMR ( CDCl 3 ) δ 8 . 61 ( 1 H , br d , J = 4 . 7 Hz ) , 7 . 54 ( 1 H , d , J = 8 . 0 Hz ) , 7 . 44 ( 1 H , d , J = 2 . 1 Hz ) , 7 . 34 ( 1 H , d , J = 7 . 7 Hz ) , 7 . 27 - 7 . 30 ( 1 H , m ) , 7 . 19 - 7 . 25 ( 1 H , m ) , 4 . 48 - 4 . 65 ( 3 H , m ) , 3 . 96 - 4 . 16 ( 2 H , m ) , 3 . 89 ( 1 H , br s ) , 3 . 56 ( 1 H , br d , J = 13 . 0 Hz ) , 3 . 18 ( 1 H , br d , J = 13 . 1 Hz ) , 2 . 67 - 2 . 82 ( 1 H , m ) , 2 . 16 - 2 . 28 ( 3 H , m ) .