1 H NMR ( CDCl 3 ) δ 8 . 60 ( 1 H , ddd , J = 4 . 9 , 1 . 8 , 1 . 2 Hz ) , 7 . 52 ( 1 H , ddd , J = 7 . 9 , 1 . 8 , 1 . 2 Hz ) , 7 . 29 ( 1 H , dd , J = 1 . 8 , 1 . 8 Hz ) , 7 . 25 ( 1 H , dd , J = 7 . 9 , 4 . 9 Hz ) , 7 . 14 - 7 . 08 ( 1 H , br ) , 7 . 11 ( 1 H , ddd , J = 9 . 2 , 1 . 8 , 1 . 8 Hz ) , 4 . 79 - 4 . 63 ( 3 H , m ) , 4 . 46 ( 1 H , br ) , 2 . 61 - 2 . 26 ( 3 H , m ) , 2 . 02 ( 1 H , m ) .