1 H NMR ( 400 MHz , 메탄올 - d 4 ) δ 8 . 75 ( d , J = 2 . 2 Hz , 1 H ) , 8 . 69 ( d , J = 2 . 1 Hz , 1 H ) , 8 . 47 ( s , 1 H ) , 8 . 25 ( s , 1 H ) , 7 . 91 ( d , J = 5 . 1 Hz , 1 H ) , 7 . 21 ( d , J = 5 . 0 Hz , 1 H ) , 3 . 56 ( s , 3 H ) , 3 . 42 - 3 . 35 ( m , 2 H ) , 2 . 25 ( t , J = 7 . 8 Hz , 6 H ) , 2 . 05 - 1 . 96 ( m , 2 H ) , 1 . 90 ( dd , J = 10 . 3 , 5 . 7 Hz , 6 H ) , 1 . 31 ( s , 6 H ) .