Spiro(isobenzofuran-1(3H),9'(9H)-xanthen)-3-one, 4,5,6,7-tetrachloro-3',6'-dihydroxy-2',4',5',7'-tetraiodo-

ChEBI: Rose bengal free acid is a xanthene dye that is fluorescein bearing bromine substituents at positions 2', 4', 5' and 7' (on the xanthene ring) and iodine substituents at position 2, 3, 4, and 5 (on the phenyl ring). The dipotassium salt is the biological stain 'rose bengal'. It has a role as a fluorochrome. It is a member of benzoic acids, a tetrachlorobenzene, a xanthene dye, a member of phenols and an organoiodine compound. It is functionally related to a fluorescin. It is a conjugate acid of a rose bengal(2-).