3',6'-diacetyloxy-1-oxospiro[2-benzofuran-3,9'-xanthene]-4-carboxylic acid,3',6'-diacetyloxy-1-oxospiro[2-benzofuran-3,9'-xanthene]-5-carboxylic acid;5(6)-Carboxy-di-O-acetylfluorescein;3',6'-Diacetoxy-3-oxo-3H-spiro[2-benzofuran-1,9'-xanthene]-6-carboxylic acid - 3',6'-diacetoxy-3-oxo-3H-spiro[2-benzofuran-1,9'-xanthene]-7-carboxylic acid (1:1);Spiro[isobenzofuran-1(3H),9'-[9H]xanthene]-6-carboxylic acid, 3',6'-bis(acetyloxy)-3-oxo-, compd. with 3',6'-bis(acetyloxy)-3-oxospiro[isobenzofuran-1(3H),9'-[9H]xanthene]-7-carboxylic acid (1:1);5(6)-CFDA
2-8℃