1 H NMR ( 400 MHz , 메탄올 - d 4 ) δ 8 . 75 ( s , 2 H ) , 8 . 55 ( s , 1 H ) , 8 . 36 ( s , 1 H ) , 7 . 94 ( d , J = 5 . 1 Hz , 1 H ) , 7 . 22 ( d , J = 5 . 1 Hz , 1 H ) , 4 . 40 ( ddd , J = 49 . 1 , 9 . 4 , 2 . 1 Hz , 1 H ) , 3 . 90 ( ddd , J = 36 . 4 , 14 . 6 , 2 . 2 Hz , 1 H ) , 3 . 47 ( ddd , J = 16 . 0 , 14 . 5 , 9 . 4 Hz , 1 H ) , 2 . 64 ( s , 3 H ) , 2 . 26 ( s , 12 H ) , 1 . 28 ( d , J = 1 . 7 Hz , 6 H ) .