Carbazochrome Sodium Sulfonate
sodium 5-(carbamoylhydrazono)-2,3,5,6-tetrahydro-1-methyl-6-oxo-1h-indole-2-sulphonate; (5E)-3-hydroxy-1-methyl-2,3-dihydro-1H-indole-5,6-dione 5-semicarbazone; sodium (5E)-5-(carbamoylhydrazono)-1-methyl-6-oxo-2,3,5,6-tetrahydro-1H-indole-2-sulfonate; sodium (5Z)-5-(carbamoylhydrazono)-1-methyl-6-oxo-2,3,5,6-tetrahydro-1H-indole-2-sulfonate