[2,7-dibromo-9-(2-carboxyphenyl)-6-hydroxy-3-oxo-3H-xanthen-5-yl](hydroxy)mercury

2,7-dibromo-4-hydroxymercurifluorescein is a xanthene dye that is fluorescein bearing bromine substituents at positions 2 and 7 as well as a hydroxymercurio substituent at position 4. It has a role as an antiseptic drug, a fluorochrome and a histological dye. It is an arylmercury compound, a member of benzoic acids, an organobromine compound and a xanthene dye. It is functionally related to a fluorescein (lactone form). It is a conjugate acid of a 2,7-dibromo-4-hydroxymercurifluorescein(2-).