The molecule is an organic sodium salt which is the disodium salt of eosin b diphenol. It has a role as a fluorescent dye and a histological dye. It contains an eosin b(2-).
disodium;4',5'-dibromo-2',7'-dinitro-3-oxospiro[2-benzofuran-1,9'-xanthene]-3',6'-diolate