Flucytosine

Also known as: 5-Fluorocytosine, 5-FC, 4-Amino-5-fluoro-2(1H)-pyrimidinone, 4-Amino-5-fluoro-2-hydroxypyrimidine, Ancobon, Ancotil, Flucytosine

Flucytosine (CAS 2022-85-7) is a compound in the Pharma Intermediates category listed in the Jingsj chemical database. It has the molecular formula C4H4FN3O and a molecular weight of 129.092 g/mol. Key properties include a melting point of 298-300 °C (dec.)(lit.), a boiling point of 298ºC and a density of 1.7±0.1 g/cm3. It is classified under GHS with signal word Warning and hazard statements H361 — Suspected of damaging fertility or the unborn child. No supplier offers are currently listed; request a quote. Record last updated Aug 21, 2026.

CAS No.: 2022-85-7
Jingsj CID: J-44400-8
Molecular Formula: C₄H₄FN₃O
Molecular Weight: 129.092 g/mol
Category: Pharma Intermediates
Last updated: 8/21/2026

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Physicochemical Properties

Melting Point	298-300 °C (dec.)(lit.)
Boiling Point	298ºC
Density	1.7±0.1 g/cm3
Exact Mass	129.033844
PSA	71.77000
LogP	-2.36
Vapor Pressure	0.0492mmHg at 25°C
Refractive Index	1.649
Additional Property	1.5g/100mL (25 ºC)

GHS Safety & Compliance

Health HazardSignal word: Warning

H361 — Suspected of damaging fertility or the unborn child

Activity & Biological Data

Additional Information	[1]. Vermes A, et al. Flucytosine: a review of its pharmacology, clinical indications, pharmacokinetics, toxicity and drug interactions. J Antimicrob Chemother. 2000 Aug;46(2):171-9. [2]. Te Dorsthorst DT, et al. In vitro interaction of flucytosine combined with amphotericin B or fluconazole against thirty-five yeast isolates determined by both the fractional inhibitory concentration index and the response surface approach. Antimicrob Agen

Additional Information

[1]. Vermes A, et al. Flucytosine: a review of its pharmacology, clinical indications, pharmacokinetics, toxicity and drug interactions. J Antimicrob Chemother. 2000 Aug;46(2):171-9. [2]. Te Dorsthorst DT, et al. In vitro interaction of flucytosine combined with amphotericin B or fluconazole against thirty-five yeast isolates determined by both the fractional inhibitory concentration index and the response surface approach. Antimicrob Agen

Customs & Trade Information

HS Code	2933599090
Summary	2933599090. other compounds containing a pyrimidine ring (whether or not hydrogenated) or piperazine ring in the structure. 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 Flucytosine?

The CAS number of Flucytosine is 2022-85-7.

What are the molecular formula and molecular weight of Flucytosine?

Flucytosine has molecular formula C4H4FN3O and molecular weight 129.092 g/mol.

Is Flucytosine hazardous?

Flucytosine has GHS signal word Warning and hazard statements H361 — Suspected of damaging fertility or the unborn child.

What are the upstream and downstream products of Flucytosine?

For Flucytosine, Downstream Products: 5-Fluorouracil, 5-Fluoro-1H-pyrimidin-2-one, 2',3'-Di-O-acetyl-5'-deoxy-5-fluorocytidine.

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. "Flucytosine (CAS 2022-85-7)". Jingsj Chemical Database. https://www.jingsj.com/compound/J-44400-8 (accessed 2026-11-09).

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