111843-78-8 5'(6)-Carboxy-2'7'-dichlorofluorescein 5(6)-Carboxy-2',7'-dichlorofluorescein CDCF ClCF Spiro(isobenzofuran-1(3H),9'-(9H)xanthene)carboxylic acid, 2',7'-dichloro-3',6'-dihydroxy-3-oxo-