Fluorescein 6-isothiocyanate
Also known as: 6-FITC, FITC isomer II, 6-Isothiocyanatofluorescein, Fluorescein-6-isothiocyanate, 3',6'-Dihydroxy-6-isothiocyanatospiro[isobenzofuran-1(3H),9'-[9H]xanthen]-3-one
Fluorescein 6-isothiocyanate (CAS 3326-31-6) is a compound in the Organic Acids category listed in the Jingsj chemical database. It has the molecular formula C21H11NO5S and a molecular weight of 389.381 g/mol. Key properties include a boiling point of 719.1±60.0 °C at 760 mmHg, a density of 1.5±0.1 g/cm3 and a flash point of 388.7±32.9 °C. No supplier offers are currently listed; request a quote. Record last updated Aug 21, 2026.
- CAS No.
- 3326-31-6
- Jingsj CID
- J-1957203-3
- Molecular Formula
- C21H11NO5S
- Molecular Weight
- 389.381 g/mol
- Category
- Organic Acids
- Last updated
- 8/21/2026
No offers for this compound yet.
Request a quotePhysicochemical Properties
| Boiling Point | 719.1±60.0 °C at 760 mmHg |
|---|---|
| Density | 1.5±0.1 g/cm3 |
| Flash Point | 388.7±32.9 °C |
| Exact Mass | 389.035797 |
| PSA | 120.44000 |
| LogP | 4.00 |
| Vapor Pressure | 0.0±2.4 mmHg at 25°C |
| Refractive Index | 1.754 |
Customs & Trade Information
| HS Code | 2932999099 |
|---|---|
| Summary | 2932999099. other heterocyclic compounds with oxygen hetero-atom(s) only. VAT:17.0%. Tax rebate rate:13.0%. . MFN tariff:6.5%. General tariff:20.0% |
Frequently Asked Questions
What is the CAS number of Fluorescein 6-isothiocyanate?
The CAS number of Fluorescein 6-isothiocyanate is 3326-31-6.
What are the molecular formula and molecular weight of Fluorescein 6-isothiocyanate?
Fluorescein 6-isothiocyanate has molecular formula C21H11NO5S and molecular weight 389.381 g/mol.
What are the upstream and downstream products of Fluorescein 6-isothiocyanate?
For Fluorescein 6-isothiocyanate, Downstream Products: Fluorescein.
Data compiled from public chemical databases such as PubChem and supplier catalogs; supplier offers are provided by suppliers.
Last updated:
How to cite: Jingsj. "Fluorescein 6-isothiocyanate (CAS 3326-31-6)". Jingsj Chemical Database. https://www.jingsj.com/compound/J-1957203-3 (accessed 2026-11-09).
Data for reference only; verify product details with suppliers before purchase.