1 H NMR ( 400 MHz , 메탄올 - d 4 ) δ 8 . 39 ( s , 1 H ) , 7 . 85 ( d , J = 2 . 6 Hz , 1 H ) , 7 . 43 ( dd , J = 8 . 8 , 2 . 6 Hz , 1 H ) , 6 . 70 ( d , J = 8 . 8 Hz , 1 H ) , 6 . 56 ( s , 1 H ) , 4 . 45 ( ddd , J = 49 . 1 , 9 . 2 , 2 . 2 Hz , 1 H ) , 3 . 92 ( ddd , J = 35 . 9 , 14 . 5 , 2 . 3 Hz , 1 H ) , 3 . 58 - 3 . 41 ( m , 1 H ) , 1 . 30 ( d , J = 1 . 7 Hz , 6 H ) .