1 H NMR ( 400 MHz , 메탄올 - d 4 ) δ 8 . 75 ( s , 1 H ) , 8 . 69 ( d , J = 2 . 2 Hz , 1 H ) , 8 . 60 ( d , J = 2 . 2 Hz , 1 H ) , 8 . 53 ( s , 1 H ) , 8 . 06 ( d , J = 8 . 5 Hz , 2 H ) , 7 . 84 ( d , J = 4 . 9 Hz , 1 H ) , 7 . 58 ( d , J = 8 . 5 Hz , 2 H ) , 7 . 15 ( d , J = 5 . 0 Hz , 1 H ) , 4 . 47 ( dd , J = 49 . 1 , 7 . 4 Hz , 1 H ) , 3 . 98 ( dd , J = 36 . 2 , 15 . 1 Hz , 1 H ) , 3 . 76 - 3 . 35 ( m , 1 H ) , 1 . 30 ( d , J = 1 . 6 Hz , 6 H ) .