1-Chloro-7-methyl-8-amino-10-phenyl-2-phenazinone in Copper sulfate monohydrate under the existence of and sodium polysulphide return in 114 ℃ heating 64 hours, then add salt precipitation. This Pyridine is 3 – amino – 4 – methyl diphenylamine and 4-Nitrosophenol condensation, then use Disulfur dichloride and processing.
