1-Naphthalenesulfonic acid, 2-((1-(2-chloro-5-sulfophenyl)-4,5-dihydro-3-methyl-5-oxo-1H-pyrazol-4-yl)azo)-, dilithium salt 2-((1-(2-Chloro-5-sulfophenyl)-3-methyl-5-oxo-2-pyrazolin-4-yl)azo)-1-naphthalenesulfonic acid, dilithium salt 75768-96-6