2-氰基-4-硝基苯胺 、
1,8-二(苯基氨基)-9,10-蒽二酮 在
nitrosylsulfuric acid 作用下,
生成 2-[[4-[(8-anilino-9,10-dioxoanthracen-1-yl)amino]phenyl]diazenyl]-5-nitrobenzonitrile 、 2-[[4-[[8-[4-[(2-cyano-4-nitrophenyl)diazenyl]anilino]-9,10-dioxoanthracen-1-yl]amino]phenyl]diazenyl]-5-nitrobenzonitrile