1 H 　 NMR ( DMSO - d 6 , 400 MHz ) δ 10 . 41 ( s , 1 H ) , 9 . 67 ( s , 1 H ) , 9 . 18 ( s , 1 H ) , 7 . 86 - 7 . 81 ( m , 2 H ) , 7 . 69 ( s , 1 H ) , 6 . 99 ( d , J = 8 Hz , 2 H ) , 6 . 85 ( s , 1 H ) , 6 . 75 ( s , 1 H ) , 4 . 08 ( t , J = 6 Hz , 2 H ) , 3 . 92 ( s , 3 H ) , 3 . 80 ( s , 3 H ) , 3 . 58 ( t , J = 4 Hz , 4 H ) , 2 . 69 ( t , J = 6 Hz , 2 H ) , 2 . 48 ( t , J = 6 Hz , 4 H ) ( 화합물 33 ) ;