Wroblewska, E. K. published the artcile5-(3-bromo-4-hydroxy-5-methoxyphenyl)-7,7-dimethyl-7H-indolo[1,2-a] quinolinium perchlorate as a new indicator for anionic surface active agents determination, Synthetic Route of 518-67-2, the publication is Tenside, Surfactants, Detergents (2010), 47(2), 119-122, database is CAplus.
5-(3-Bromo-4-hydroxy-5-methoxyphenyl)-7,7-dimethyl-7H-indolo[1,2-a]quinolinium perchlorate (la) was used as an indicator for anionic surface active agents determination in the manual direct two-phase titration according to the International Standard [ISO 2271: 1989] Surface active agents. The solvatochromic dye (la) can successfully replace the recommended mixed indicator consisting of a mixture of Acid Blue I and carcinogenic dimidium bromide. The detection of the titration endpoint with use of this dye turned out much easier than with the use of the mixed indicator. The procedure was also modified replacing carcinogenic and mutagenic chloroform with less toxic dichloromethane. The concentrations of the anionic surface – active substances in few com. available products were determined using modified two-phase titration method.
Tenside, Surfactants, Detergents published new progress about 518-67-2. 518-67-2 belongs to bromides-buliding-blocks, auxiliary class Other Aromatic Heterocyclic,Salt,Amine,Benzene, name is Dimidium bromide, and the molecular formula is C22H12F6O6S2, Synthetic Route of 518-67-2.
Referemce:
https://en.wikipedia.org/wiki/Bromide,
bromide – Wiktionary