1 H 　 NMR ( DMSO - d 6 , 400 MHz ) δ 10 . 31 ( s , 1 H ) , 9 . 64 ( s , 1 H ) , 9 . 15 ( s , 1 H ) , 7 . 74 ( br , 2 H ) , 7 . 67 ( s , 1 H ) , 6 . 90 ( d , J = 8 Hz , 2 H ) , 6 . 84 ( s , 1 H ) , 6 . 75 ( s , 1 H ) , 3 . 91 ( s , 3 H ) , 3 . 80 ( s , 3 H ) , 3 . 44 - 3 . 39 ( m , 2 H ) , 3 . 09 - 3 . 09 ( m , 2 H ) , 2 . 50 ( br , 2 H ) , 2 . 45 ( s , 3 H ) , 2 . 07 - 2 . 05 ( m , 2 H ) , 1 . 80 - 1 . 78 ( m , 2 H ) ( 화합물 23 ) ;