3348-03-6 6-Carboxy-3',6'-diacetylfluorescein 6-Carboxyfluorescein diacetate 6-Cfda Spiro(isobenzofuran-1(3H),9'-(9H)xanthene)-6-carboxylic acid, 3',6'-bis(acetyloxy)-3-oxo- Spiro(phthalan-1,9'-xanthene)-6-carboxylic acid, 3',6'-dihydroxy-3-oxo-, diacetate