1 H NMR ( 400 MHz , 메탄올 - d 4 ) δ 8 . 73 ( d , J = 2 . 2 Hz , 1 H ) , 8 . 62 ( d , J = 2 . 2 Hz , 1 H ) , 8 . 56 ( s , 1 H ) , 7 . 87 ( s , 1 H ) , 7 . 83 ( d , J = 5 . 0 Hz , 1 H ) , 7 . 19 ( d , J = 5 . 0 Hz , 1 H ) , 4 . 42 ( ddd , J = 49 . 1 , 9 . 3 , 2 . 2 Hz , 1 H ) , 4 . 10 - 3 . 80 ( m , 1 H ) , 3 . 60 - 3 . 38 ( m , 1 H ) , 1 . 28 ( d , J = 1 . 6 Hz , 6 H ) .