Synonyms: Fluorescein,2',7'-dibromo-4'-(hydroxymercuri)- (7CI);(2',7'-Dibromo-3',6'-dihydroxy-3-oxospiro(isobenzofuran-1(3H),9'-(9H)xanthen)-4'-yl)hydroxy-;(2',7'-Dibromo-3',6'-dihydroxy-3-oxo-3H-spiro[2-benzofuran-1,9'-xanthen]-4'-yl)(hydroxy)mercury;