116189-73-2 153474-60-3 2',7'-Dichlorofluorescein 2-(2,7-Dichloro-6-hydroxy-3-oxo-3H-xanthen-9-yl)benzoic acid 76-54-0 87714-38-3 EINECS 200-968-6 Spiro(isobenzofuran-1(3H),9'-(9H)xanthen)-3-one, 2',7'-dichloro-3',6'-dihydroxy-