1-Methyl-6-oxo-5-(semicarbazono)-2,3,5,6-tetrahydro-1H-indole-3-sulfonic acid sodium salt

sodium 5-[(aminocarbonyl)hydrazono]-2,3,5,6-tetrahydro-1-methyl-6-oxo-1H-indole-3-sulphonate

5-[2-(Aminocarbonyl)hydrazono]-2,3,5,6-tetrahydro-1-methyl-6-oxo-1H-indole-3-sulfonic acid sodium salt