1 H NMR ( CDCl 3 ) δ 8 . 62 ( 1 H , dt , J = 4 . 7 , 1 . 6 Hz ) , 7 . 49 ( 1 H , dt , J = 7 . 8 , 1 . 5 Hz ) , 7 . 41 ( 1 H , dd , J = 8 . 5 , 6 . 1 Hz ) , 7 . 09 - 7 . 25 ( 3 H , m ) , 6 . 99 ( 1 H , td , J = 8 . 3 , 2 . 6 Hz ) , 4 . 53 - 4 . 67 ( 2 H , m ) , 4 . 41 ( 1 H , quin , J = 5 . 78 Hz ) , 3 . 74 - 3 . 82 ( 1 H , m ) , 3 . 57 ( 1 H , br s ) , 3 . 07 - 3 . 16 ( 2 H , m ) , 3 . 00 ( 1 H , br t , J = 6 . 4 Hz ) , 2 . 85 ( 1 H , d , J = 12 . 8 Hz ) , 2 . 56 - 2 . 77 ( 1 H , m ) , 2 . 13 - 2 . 37 ( 4 H , m ) .