Merbromina
Merbromin is an organic sodium salt that is 2,7-dibromo-4-hydroxymercurifluorescein in which the carboxy group and the phenolic hydroxy group have been deprotonated and the resulting charge is neutralised by two sodium ions. It has a role as an antiseptic drug, a fluorochrome and a histological dye. It contains a 2,7-dibromo-4-hydroxymercurifluorescein(2-).