1 H NMR ( CDCl 3 ) δ 8 . 65 ( 1 H , m ) , 7 . 59 ( 1 H , m ) , 7 . 40 ( 1 H , d , J = 1 . 8 Hz ) , 7 . 27 ( 1 H , m ) , 7 . 19 ( 1 H , m ) , 7 . 12 ( 1 H , d , J = 8 . 6 Hz ) , 7 . 03 ( 1 H , br ) , 3 . 88 ( 0 . 5 H , d , J = 6 . 1 Hz ) , 3 . 87 ( 0 . 5 H , d , J = 6 . 1 Hz ) , 3 . 10 ( 1 H , m ) , 3 . 03 ( 1 H , d , J = 6 . 1 Hz ) , 2 . 79 ( 1 H , m ) , 2 . 60 ( 1 H , m ) , 2 . 39 - 2 . 29 ( 2 H , m ) , 2 . 15 ( 1 H , m ) , 1 . 43 - 1 . 31 ( 2 H , m ) .