2,3,4,5-tetrachloro-4',5'-dihydroxy-fluorescein tetraacetate 2,3,4,5-tetrachloro-6-(3',4',5',6'-tetraacetoxy-9H-xanthen-9-yl)-benzoic acid 2,3,4,5-tetrachlorogallein tetraacetate 9-(6-carboxy-2',3',4',5'-tetrachlorophenyl)-3,4,5,6-tetraacetoxy-xanthylium NSC723403