1 H NMR ( 400 MHz , 메탄올 - d 4 ) δ 8 . 84 ( d , J = 2 . 1 Hz , 1 H ) , 8 . 76 ( d , J = 2 . 2 Hz , 1 H ) , 8 . 61 ( s , 1 H ) , 8 . 50 ( s , 1 H ) , 7 . 93 ( d , J = 5 . 1 Hz , 1 H ) , 7 . 23 ( d , J = 5 . 1 Hz , 1 H ) , 4 . 42 ( ddd , J = 49 . 0 , 9 . 4 , 2 . 0 Hz , 1 H ) , 3 . 93 ( ddd , J = 36 . 5 , 14 . 6 , 2 . 1 Hz , 1 H ) , 3 . 47 ( td , J = 15 . 8 , 9 . 4 Hz , 1 H ) , 2 . 61 ( s , 6 H ) , 1 . 28 ( d , J = 1 . 6 Hz , 6 H ) .