1 H NMR ( CDCl 3 ) δ 8 . 61 ( 1 H , m ) , 7 . 55 ( 1 H , m ) , 7 . 50 ( 1 H , d , J = 1 . 8 Hz ) , 7 . 36 ( 1 H , br d , J = 7 . 9 Hz ) , 7 . 31 - 7 . 23 ( 2 H , m ) , 7 . 20 ( 1 H , br d , J = 5 . 5 Hz ) , 4 . 67 - 4 . 56 ( 3 H , m ) , 3 . 92 - 3 . 52 ( 5 H , m ) , 2 . 82 ( 1 H , m ) , 2 . 7 ( 1 H , br ) , 2 . 36 - 2 . 07 ( 3 H , m ) , 1 . 8 ( 1 H , br ) .