1 H NMR ( CDCl 3 ) δ 8 . 61 ( 1 H , br dd , J = 4 . 9 , 1 . 8 Hz ) , 7 . 59 ( 1 H , br ) , 7 . 45 ( 1 H , d , J = 1 . 8 Hz ) , 7 . 43 ( 1 H , br dd , J = 7 . 9 , 1 . 8 Hz ) , 7 . 36 ( 1 H , d , J = 1 . 8 Hz ) , 7 . 21 ( 1 H , dd , J = 7 . 9 , 4 . 9 Hz ) , 4 . 80 ( 1 H , dd , J = 14 . 7 , 6 . 1 Hz ) , 4 . 78 ( 2 H , d , J = 6 . 1 Hz ) , 4 . 71 ( 1 H , dd , J = 14 . 7 , 6 . 1 Hz ) , 3 . 85 ( 1 H , d , J = 6 . 1 Hz ) , 3 . 73 ( 1 H , t , J = 6 . 1 Hz ) , 3 . 02 ( 1 H , d , J = 6 . 1 Hz ) , 2 . 71 ( 1 H , m ) , 2 . 54 ( 1 H , m ) , 2 . 29 ( 1 H , m ) , 2 . 10 ( 1 H , m ) .