3',6'-Bis(acetyloxy)-3-oxospiro(isobenzofuran-1(3H),9'-(9H)xanthene)-5-carboxylic acid 5-Carboxyfluorescein diacetate 79955-27-4 Cfda-5 Spiro(isobenzofuran-1(3H),9'-(9H)xanthene)-5-carboxylic acid, 3',6'-bis(acetyloxy)-3-oxo-