1,3-Dichloro-2-hydroxy-7-methyl-8-aminophenazine?and sodium polysulphide aqueous solution in the presence of copper sulfate, return in 106 ℃ heating 22 hours, dilution and drum drying. This is Pyridine by4-Methylbenzene-1,3-diamine and 4-Amino-2,6-dichlorophenol?Manganese dioxide oxidation with the mixture and be (BIOS 1155, – 33)
