2,4-Diaminobenzenesulfonic acid diazo, and 6-hydroxy-1,4-dimethyl-2-oxo-1,2-dihydropyridine-3-carboxamide coupling, and 2,4,6-Trichloro-1,3,5-triazine condensation, and then and registration, 2-(3-Aminophenylsulfonyl)ethyl hydrogen sulfate condensation.
