1 H NMR ( 400 MHz , DMSO - d 6 ) : δ [ ppm ] = 1 . 15 ( s , 6 H ) , 3 . 31 - 3 . 36 ( m , 2 H 및 물 신호 ) , 3 . 94 ( s , 3 H ) , 4 . 71 ( s , 1 H ) , 7 . 89 ( d , 2 H ) , 8 . 14 ( s , 1 H ) , 8 . 30 ( d , 2 H ) , 8 . 58 ( s , 1 H ) , 8 . 66 ( s , 1 H ) , 9 . 63 ( t , 1 H ) .