5-(6)-Carboxyfluoresceindiacetate;CFDA;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);
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