1 H 　 NMR ( DMSO - d 6 , 400 MHz ) δ 9 . 67 ( s , 1 H ) , 9 . 16 ( s , 1 H ) , 7 . 78 ( brs , 2 H ) , 7 . 68 ( s , 1 H ) , 7 . 02 ( d , J = 8 Hz , 2 H ) , 6 . 85 ( s , 1 H ) , 6 . 76 ( s , 1 H ) , 3 . 93 ( s , 3 H ) , 3 . 81 ( s , 3 H ) , 3 . 16 ( brs , 4 H ) , 2 . 75 - 2 . 59 ( m , 4 H ) , 2 . 44 - 2 . 33 ( m , 2 H ) , 1 . 09 ( t , J = 6 Hz , 3 H ) ( 화합물 4 ) ;