6-Aminofluorescein

Also known as: Fluoresceinamine isomer II, 6-Amino-3',6'-dihydroxyspiro[isobenzofuran-1(3H),9'-(9H)xanthen]-3-one, Spiro[isobenzofuran-1(3H),9'-[9H]xanthen]-3-one, 6-amino-3',6'-dihydroxy-, Fluoresceinamine, isomer II

6-Aminofluorescein (CAS 51649-83-3) is a compound in the Organic Compounds category listed in the Jingsj chemical database. It has the molecular formula C20H13NO5 and a molecular weight of 347.321 g/mol. Key properties include a melting point of 285 °C (dec.)(lit.), a boiling point of 706.7±60.0 °C at 760 mmHg, a density of 1.6±0.1 g/cm3 and a flash point of 381.2±32.9 °C. It is classified under GHS with signal word Warning and hazard statements H315 — Causes skin irritation, H319 — Causes serious eye irritation and H335 — May cause respiratory irritation. No supplier offers are currently listed; request a quote. Record last updated Aug 21, 2026.

CAS No.: 51649-83-3
Jingsj CID: J-32488-9
Molecular Formula: C₂₀H₁₃NO₅
Molecular Weight: 347.321 g/mol
Category: Organic Compounds
Last updated: 8/21/2026

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Physicochemical Properties

Melting Point	285 °C (dec.)(lit.)
Boiling Point	706.7±60.0 °C at 760 mmHg
Density	1.6±0.1 g/cm3
Flash Point	381.2±32.9 °C
Exact Mass	347.079376
PSA	102.01000
LogP	2.20
Vapor Pressure	0.0±2.3 mmHg at 25°C
Refractive Index	1.820

GHS Safety & Compliance

IrritantSignal word: Warning

H315 — Causes skin irritation
H319 — Causes serious eye irritation
H335 — May cause respiratory irritation

Frequently Asked Questions

What is the CAS number of 6-Aminofluorescein?

The CAS number of 6-Aminofluorescein is 51649-83-3.

What are the molecular formula and molecular weight of 6-Aminofluorescein?

6-Aminofluorescein has molecular formula C20H13NO5 and molecular weight 347.321 g/mol.

Is 6-Aminofluorescein hazardous?

6-Aminofluorescein has GHS signal word Warning and hazard statements H315 — Causes skin irritation; H319 — Causes serious eye irritation; H335 — May cause respiratory irritation.

What are the upstream and downstream products of 6-Aminofluorescein?

For 6-Aminofluorescein, Upstream Products: Resorcinol, 6-Nitrofluorescein, 4-Nitrophthalic acid; Downstream Products: Fluorescein 6-isothiocyanate (isomer II).

Data compiled from public chemical databases such as PubChem and supplier catalogs; supplier offers are provided by suppliers.

Last updated: 8/21/2026

How to cite: Jingsj. "6-Aminofluorescein (CAS 51649-83-3)". Jingsj Chemical Database. https://www.jingsj.com/compound/J-32488-9 (accessed 2026-11-09).

Data for reference only; verify product details with suppliers before purchase.