Natrium 5-[4-dimethylamino-α-(4-dimethyliminocyclohexa-2,5-dienyliden)benzyl]-6-hydroxy-7- sulfonatonaphthalen-2-sulfonat (alternativt kemisk navn)
Sodium 5-[4-dimethylamino-α-(4-dimethyliminocyclohexa-2,5-dienylidene) benzyl]-6-hydroxy-7-sulfonato-naphthalene-2-sulfonate (alternative chemical name).