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Oregon Green 488 Carboxylic Acid, is a novel Fluorinated Fluorescein agent that can be used in biological experiments in which fluorescein is covalently attached to materials such as peptides, proteins (especially antibodies), nucleotides, oligonucleotides, drugs, hormones, lipids, and other biomolecules.

ChEBI: Oregon green 488 is a xanthene dye having two fluoro substituents at the 2- and 7-positions and a 2,4-dicarboxyphenyl group at the 9-position. It has a role as a fluorochrome and an epitope. It is functionally related to a fluorescein (acid form).