Fluorescein isothiocyanate isomer I
Also known as: Fluorescein 5-isothiocyanate, 5-FITC, FITC isomer I, 5-Isothiocyanatofluorescein, 2-(6-Hydroxy-3-oxo-3H-xanthen-9-yl)-5-isothiocyanatobenzoic acid, 3',6'-Dihydroxy-5-isothiocyanato-3H-spiro[2-benzofuran-1,9'-xanthen]-3-one
Fluorescein isothiocyanate isomer I (CAS 3326-32-7) 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 melting point of >360 °C(lit.), a boiling point of 708.6±60.0 °C at 760 mmHg, a density of 1.5±0.1 g/cm3 and a flash point of 382.4±32.9 °C. It is classified under GHS with signal word Danger and hazard statements H317 — May cause an allergic skin reaction and H334 — May cause allergy or asthma symptoms if inhaled. It is listed by 1 supplier, from 1.26 to 1,090.00 CNY. Record last updated Nov 3, 2026.
- CAS No.
- 3326-32-7
- Jingsj CID
- J-6169-2
- Molecular Formula
- C21H11NO5S
- Molecular Weight
- 389.381 g/mol
- Category
- Organic Acids
- Last updated
- 11/3/2026
| Supplier | Purity / Pack | Base Price | Unit Price | Origin | |
|---|---|---|---|---|---|
In Stock | 90% 500mg | ¥630.00 | $0.19 /mgBest ¥1.26/mg CNY | CN China MOQ 500mg | |
In Stock | 90% 100mg | ¥168.00 | $0.25 /mg ¥1.68/mg CNY | CN China MOQ 100mg | |
In Stock | sigma 50mg | ¥240.00 | $0.72 /mg ¥4.80/mg CNY | CN China MOQ 50mg |
Physicochemical Properties
| Melting Point | >360 °C(lit.) |
|---|---|
| Boiling Point | 708.6±60.0 °C at 760 mmHg |
| Density | 1.5±0.1 g/cm3 |
| Flash Point | 382.4±32.9 °C |
| Exact Mass | 389.035797 |
| PSA | 120.44000 |
| LogP | 4.00 |
| Vapor Pressure | 0.0±2.3 mmHg at 25°C |
| Refractive Index | 1.754 |
| Additional Property | practically insoluble |
GHS Safety & Compliance
- H317 — May cause an allergic skin reaction
- H334 — May cause allergy or asthma symptoms if inhaled
Activity & Biological Data
| Additional Information | [1]. Gao SG, et al. Phosphorylation of osteopontin has proapoptotic and proinflammatory effects on human knee osteoarthritis chondrocytes. Exp Ther Med. 2016 Nov;12(5):3488-3494. Epub 2016 Oct 5. [2]. Zhu X, et al. Ratiometric, visual, dual-signal fluorescent sensing and imaging of pH/copper ions in real samples based on carbon dots-fluorescein isothiocyanate composites. Talanta. 2017 Jan 1;162:65-71 |
|---|
Frequently Asked Questions
What is the CAS number of Fluorescein isothiocyanate isomer I?
The CAS number of Fluorescein isothiocyanate isomer I is 3326-32-7.
What are the molecular formula and molecular weight of Fluorescein isothiocyanate isomer I?
Fluorescein isothiocyanate isomer I has molecular formula C21H11NO5S and molecular weight 389.381 g/mol.
Which suppliers offer Fluorescein isothiocyanate isomer I?
1 supplier(s) listed; reference unit price ¥1.26–1090.00 /mg.
Is Fluorescein isothiocyanate isomer I hazardous?
Fluorescein isothiocyanate isomer I has GHS signal word Danger and hazard statements H317 — May cause an allergic skin reaction; H334 — May cause allergy or asthma symptoms if inhaled.
What are the upstream and downstream products of Fluorescein isothiocyanate isomer I?
For Fluorescein isothiocyanate isomer I, Upstream Products: Fluorescein, Thiophosgene, 5-Aminofluorescein.
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 isothiocyanate isomer I (CAS 3326-32-7)". Jingsj Chemical Database. https://www.jingsj.com/compound/J-6169-2 (accessed 2026-11-06).
Data for reference only; verify product details with suppliers before purchase.