1 H NMR ( 400 MHz , DMSO - d 6 ) δ 9 . 19 ( s , 1 H ) , 9 . 00 ( s , 1 H ) , 8 . 68 - 8 . 57 ( br m , 1 H ) , 8 . 13 ( br AB 사 중선 , JAB = 8 . 5 Hz , Δν AB = 48 . 4 Hz , 2 H ) , 4 . 61 - 4 . 43 ( m , 1 H ) , 3 . 58 ( dd , J = 12 . 0 , 7 . 5 Hz , 1 H ) , 3 . 41 - 3 . 28 ( m , 1 H ) , 3 . 26 - 3 . 12 ( m , 1 H ) , 3 . 12 ( dd , J = 11 . 8 , 7 . 3 Hz , 1 H ) .