1 H NMR ( 400 MHz , 메탄올 - d 4 ) δ 8 . 76 ( d , J = 2 . 2 Hz , 1 H ) , 8 . 72 ( d , J = 2 . 2 Hz , 1 H ) , 8 . 56 ( s , 1 H ) , 8 . 31 ( s , 1 H ) , 7 . 94 ( d , J = 5 . 1 Hz , 1 H ) , 7 . 22 ( d , J = 5 . 1 Hz , 1 H ) , 4 . 74 ( dd , J = 9 . 4 , 2 . 0 Hz , 1 H ) , 3 . 88 ( ddd , J = 36 . 8 , 14 . 6 , 2 . 0 Hz , 1 H ) , 3 . 50 ( ddd , J = 16 . 3 , 14 . 6 , 9 . 4 Hz , 1 H ) , 2 . 28 ( s , 12 H ) , 2 . 01 ( s , 3 H ) , 1 . 56 ( d , J = 1 . 7 Hz , 6 H ) .