1 H NMR ( CDCl 3 ) δ 8 . 56 ( 1 H , d , J = 4 . 6 Hz ) , 7 . 64 ( 1 H , d , J = 7 . 3 Hz ) , 7 . 55 ( 1 H , d , J = 7 . 3 Hz ) , 7 . 42 ( 1 H , d , J = 8 . 6 Hz ) , 7 . 35 ( 1 H , br t , J = 7 . 3 Hz ) , 7 . 17 ( 1 H , dd , J = 7 . 3 , 4 . 6 Hz ) , 6 . 34 ( 1 H , s ) , 5 . 86 ( 1 H , br ) , 5 . 22 ( 1 H , s ) , 4 . 59 ( 1 H , dd , J = 14 . 5 , 5 . 9 Hz ) , 4 . 51 ( 1 H , dd , J = 14 . 5 , 5 . 9 Hz ) , 3 . 77 ( 1 H , br t , J = 5 . 3 Hz ) , 2 . 66 ( 2 H , m ) , 2 . 18 ( 1 H , m ) , 2 . 06 ( 1 H , m ) .