4-Amino-3-hydroxy-7-nitronaphthalene-1-sulfonic acid diazo, and Naphthalen-2-ol coupling, and the other will be 3-Amino-4-hydroxy-N-methylbenzenesulfonamide?diazo, and N-(2-chlorophenyl)-3-oxobutanamide coupling, and then will product into 1:2 chromium complex.
