1 H NMR ( 400 MHz , 메탄올 - d 4 ) δ 8 . 18 ( d , J = 2 . 2 Hz , 1 H ) , 7 . 56 ( dd , J = 8 . 9 , 2 . 3 Hz , 1 H ) , 6 . 75 ( d , J = 8 . 9 Hz , 1 H ) , 4 . 70 ( t , J = 6 . 6 Hz , 3 H ) , 4 . 63 ( t , J = 6 . 2 Hz , 3 H ) , 3 . 68 - 3 . 56 ( m , 6 H ) , 3 . 55 - 3 . 47 ( m , 1 H ) , 3 . 42 ( s , 1 H ) , 2 . 52 - 2 . 37 ( m , 6 H ) , 1 . 27 ( d , J = 13 . 9 Hz , 0 H ) .