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 . 64 ( s , 1 H ) , 8 . 04 ( d , J = 5 . 1 Hz , 1 H ) , 7 . 87 ( s , 1 H ) , 7 . 22 ( d , J = 5 . 1 Hz , 1 H ) , 4 . 84 - 4 . 68 ( m , 1 H ) , 4 . 42 ( ddd , J = 49 . 0 , 9 . 4 , 2 . 1 Hz , 1 H ) , 4 . 07 - 3 . 72 ( m , 2 H ) , 3 . 61 - 3 . 40 ( m , 2 H ) , 2 . 99 ( dd , J = 17 . 1 , 8 . 0 Hz , 1 H ) , 2 . 48 ( dd , J = 17 . 1 , 4 . 7 Hz , 1 H ) , 1 . 28 ( d , J = 1 . 7 Hz , 6 H ) .