Molekula
5(6)-Carboxyfluorescein
Supplying 4,500+ customers in over 80 countries
ISO 9001:2015 & ISO 14001:2015 certified · Supplying laboratories and industry since 1999 · Listed pack sizes are a starting point — we manufacture, source and repack to the quantity you need
5(6)-Carboxyfluorescein is a fluorescent dye used in biochemical assays, including flow cytometry, fluorescence microscopy, and molecular biology applications. It is commonly employed as a label for proteins, nucleic acids, and cellular tracers due to its high quantum yield and photostability. Available in powder form with a molecular formula of C21H12O7, a molecular weight of 376.32 g/mol, and stored at ambient temperature. CAS number: 72088-94-9. Signal word: Warning. Molekula supplies 5(6)-Carboxyfluorescein from research to bulk quantities with full documentation and ISO 9001:2015 traceability.
Example image for illustration only. Other packaging and pack sizes are available.
Pricing & pack sizes
In stock — same-day dispatch
These pack sizes aren't a limit. Molekula manufactures, sources and repacks to order — if you need 500 kg and only see 1 kg listed, . We quote from grams to multi-tonne.
Need a different size? Add the nearest pack and change the size in your basket — we price it at the same rate per unit.
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5 g — £124.40 per pack ex VAT · £149.28 inc. VAT
Need a different quantity or pack?
Tell us how much you need and when — drums, IBCs, sacks or a one-off bulk lot. We'll manufacture or source it and come back with a price.
Prices exclude VAT/sales tax and shipping.
Specifications
| Property | Value |
|---|---|
| Appearance | Orange coloured crystals |
| Melting Point | 275 Deg C |
| Storage Temperature | +20 ° C |
| Assay | 90% min |
| Shelf life | 5 years |
Storage & handling
| Property | Value |
|---|---|
| Storage Temperature | Ambient |
| Acidity | Neutral |
Identification
| Property | Value |
|---|---|
| SKU | 20570220 |
| CAS Number | 72088-94-9 |
| IUPAC Name | 3',6'-dihydroxy-1-oxospiro[2-benzofuran-3,9'-xanthene]-5-carboxylic acid;3',6'-dihydroxy-3-oxospiro[2-benzofuran-1,9'-xanthene]-5-carboxylic acid |
| Molecular Formula | C21H12O7 |
| Molecular Weight | 376.32 |
| Exact Mass | 752.1166 |
| SMILES | C1=CC2=C(C=C1C(=O)O)C3(C4=C(C=C(C=C4)O)OC5=C3C=CC(=C5)O)OC2=O.C1=CC2=C(C=C1C(=O)O)C(=O)OC23C4=C(C=C(C=C4)O)OC5=C3C=CC(=C5)O |
| InChIKey | BPVHBBXCESDRKW-UHFFFAOYSA-N |
| InChI | InChI=1S/2C21H12O7/c22-11-2-5-15-17(8-11)27-18-9-12(23)3-6-16(18)21(15)14-4-1-10(19(24)25)7-13(14)20(26)28-21;22-11-2-5-14-17(8-11)27-18-9-12(23)3-6-15(18)21(14)16-7-10(19(24)25)1-4-13(16)20(26)28-21/h2*1-9,22-23H,(H,24,25) |
| PubChem CID | 44119975 |
| REACH Code | Y110 |
| TSCA Listed | Yes |
| HTS Code | 32129000 |
| Tariff Code | 3212900000 |
Safety & GHS
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Health Hazard
GHS07
Hazard statements
- H319 Causes serious eye irritation
Precautionary statements
- P280 Wear protective gloves/protective clothing/eye protection/face protection
- P305+351+338 IF IN EYES: Rinse with water for several minutes. Remove contact lenses if present and easy to do. Continue rinsing
Documents
Certificate of Analysis (CoA) by batch
Enter a lot or batch number to retrieve the CoA for that specific batch. We can generate one from spec data if no PDF is on file.
Quality certificates
Molekula Group is certified to ISO 9001:2015 (quality) and ISO 14001:2015 (environmental management), audited by a UKAS-accredited body. Both certificates are valid to 17 May 2028.
Synonyms
- 3',6'-Dihydroxy-3-oxo-3H-spiro[isobenzofuran-1,9'-xanthene]-5(6)-carboxylic acid
- 5-(and-6)-carboxyfluorescein
- 5-(and-6)-FAM
- 5(6)-Carboxyfluorescein - mixture
- 5(6)-Carboxyfluorescein, mixture of isomers
- BPVHBBXCESDRKW-UHFFFAOYSA-N
Frequently asked questions
What is 5(6)-Carboxyfluorescein used for?
It is commonly used as a fluorescent dye in biological and biochemical applications, such as labeling biomolecules, tracking cellular processes, and flow cytometry.
What is the chemical formula and molecular weight of 5(6)-Carboxyfluorescein?
The formula is C21H12O7 with a molecular weight of 376.32 g/mol.
How should 5(6)-Carboxyfluorescein be stored?
It should be stored at ambient temperature, protected from light and moisture.
What grade is available for 5(6)-Carboxyfluorescein?
Available in high-purity grade suitable for research and diagnostic applications.
Can Molekula supply 5(6)-Carboxyfluorescein in bulk?
Yes, Molekula can supply 5(6)-Carboxyfluorescein in bulk quantities—please contact sales for details.
What documentation comes with an order of 5(6)-Carboxyfluorescein?
Each order includes a Certificate of Analysis (CoA) and safety data sheet (SDS) with the shipment.
Ready to order or need a custom pack?
Tell us the product, grade, and quantity — Molekula usually responds within one working day with pricing and lead time.