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CAS 1 record

CAS 2321-07-5

CAS 2321-07-5 matches 1 EU annex record across Annex II–VI of Regulation 1223/2009.

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Chemical identity and properties

PubChem 2D chemical structure for CAS 2321-07-5
CAS 2321-07-5PubChem CID 16850

Fluorescein

Fluorescein (lactone form) is a xanthene dye that is highly fluorescent, detectable even when present in minute quantities. Used forensically to detect traces of blood, in analytical chemistry as an indicator in silver nitrate titrations and in microscopy. It has a role as a radioopaque medium and a fluorescent dye. It is a polyphenol, a gamma-lactone, a xanthene dye, an oxaspiro compound, an organic heteropentacyclic compound and a member of 2-benzofurans. It is functionally related to a fluorescein (acid form). — ChEBI

IUPAC name
3',6'-dihydroxyspiro[2-benzofuran-3,9'-xanthene]-1-one
Molecular formula
C20H12O5
Molecular weight
332.3 g/mol
Exact mass
332.06847348 Da
XLogP3
3.4
Topological polar surface area
76.0 Ų
Hydrogen-bond donors
2
Hydrogen-bond acceptors
5
Covalent units
1
Defined stereocentres
0

Also known as

Solvent Yellow 94ResorcinolphthaleinYellow fluoresceinFluoresceineFluorescein acid3,6-FluorandiolD&C Yellow No. 73',6'-Dihydroxyfluoran
16 more reported names
Japan Yellow 201D and C Yellow No. 7C.I. Solvent Yellow 94Soap Yellow FHidacid fluoresceinYellow 7FluoreszeinFluorescein RedD+C Yellow No. 711712 YellowCHEBI:31624Japan Yellow No. 201Zlut kysela 733',6'-FluorandiolKi201NSC-667256
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External database identifiers

Retrieved from NIH PubChem on 2026-09-02 by checksum-valid CAS matching. Chemical properties do not replace the regulatory decision on this page.

Records for CAS 2321-07-5

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No records found for this CAS number.

How CAS 2321-07-5 is used on this site

CAS 2321-07-5 is the Chemical Abstracts Service identifier used to pin this page to a specific substance. In the current dataset, 1 EU annex record shares this identifier, which helps you cross-check whether the same substance appears under one regulatory context or several.

Use this page when a supplier specification, SDS or raw-material dossier gives you CAS 2321-07-5 and you need to see every linked Annex II–VI record in one place. The entry cards above are the quickest route to concentration limits, warnings, annex placement and product-type conditions.