1 H NMR ( 400 MHz , 메탄올 - d 4 ) δ 8 . 69 ( d , J = 2 . 2 Hz , 1 H ) , 8 . 63 ( d , J = 2 . 2 Hz , 1 H ) , 8 . 58 ( s , 1 H ) , 7 . 95 ( d , J = 5 . 0 Hz , 1 H ) , 7 . 73 ( s , 1 H ) , 7 . 17 ( d , J = 5 . 0 Hz , 1 H ) , 4 . 56 - 4 . 33 ( m , 2 H ) , 3 . 94 ( ddd , J = 36 . 2 , 14 . 6 , 2 . 2 Hz , 1 H ) , 3 . 62 ( s , 3 H ) , 3 . 53 - 3 . 40 ( m , 3 H ) , 2 . 89 ( ddd , J = 19 . 0 , 14 . 3 , 8 . 4 Hz , 2 H ) , 2 . 42 ( ddd , J = 19 . 8 , 14 . 1 , 5 . 7 Hz , 2 H ) , 1 . 29 ( d , J = 1 . 6 Hz , 6 H ) .