1 H NMR ( CDCl 3 ) δ 8 . 63 ( 1 H , ddd , J = 4 . 3 , 1 . 8 , 1 . 8 Hz ) , 7 . 55 ( 1 H , dd , J = 7 . 9 , 1 . 8 Hz ) , 7 . 39 ( 1 H , br ) , 7 . 25 ( 1 H , m ) , 3 . 87 ( 0 . 7 H , d , J = 6 . 1 Hz ) , 3 . 7 . - 3 . 69 ( 4 H , m ) , 3 . 54 - 3 . 42 ( 2 . 3 H , m ) , 3 . 06 ( 0 . 3 H , d , J = 6 . 1 Hz ) , 3 . 03 ( 0 . 7 H , d , J = 6 . 1 Hz ) , 2 . 85 - 2 . 38 ( 6 H , m ) , 2 . 31 ( 1 H , m ) , 2 . 15 ( 1 H , m ) , 1 . 76 - 1 . 46 ( 10 H , m ) .