Balthazar, Zsolt published the artcileTwo-phase titration of anionic surfactants, I. Study of the transition point of the titration carried out according to ISO 2271, Formula: C20H18BrN3, the publication is Magyar Kemiai Folyoirat (1977), 83(7), 294-7, database is CAplus.
Some properties of the Disulphine Blue [64366-33-2]-dimidium bromide [518-67-2] indicator system, prescribed by the international standard, were examined by UV-visible spectrometry. The dyes appeared in the CHCl3 phase only in the presence of an oppositely charged surfactant. In the modeling of practical end-points, the absorbance of the CHCl3 phase was markedly influenced by the presence of an anionic or cationic surfactant. The titration end-point determined photometrically using the 2 indicators was identical within exptl. error.
Magyar Kemiai Folyoirat 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 C20H18BrN3, Formula: C20H18BrN3.
Referemce:
https://en.wikipedia.org/wiki/Bromide,
bromide – Wiktionary