Synonyms: 1H-Indole-3-sulfonicacid, 5-[(aminocarbonyl)hydrazono]-2,3,5,6-tetrahydro-1-methyl-6-oxo-,monosodium salt (9CI); 3-Indolinesulfonic acid,5,6-dihydro-1-methyl-5,6-dioxo-, 5-semicarbazone, monosodium salt (8CI);3-Indolinesulfonic acid, 5,6-dihydro-1-methyl-5,6-dioxo-, 5-semicarbazone, sodiumsalt (7CI); 5,6-Dihydro-1-methyl-5,6-dioxo-3-indoline sulfonic acid5-semicarbazone sodium salt; Sodium1-methyl-6-oxo-5-semicarbazono-2,3,5,6-tetrahydroindole-3-sulfonate