Ciprofloxacin

Also known as: Ciprofloxacin (free base), 1-Cyclopropyl-6-fluoro-1,4-dihydro-4-oxo-7-(1-piperazinyl)-3-quinolinecarboxylic acid, Bayq 3939, Baycip, Ciprobay, Ciloxan, Cipro, CPFX, Ciprine, Ciprobid, Ciprofloxacin USP, Euciprin

Ciprofloxacin (CAS 85721-33-1) is a compound in the Organic Compounds category listed in the Jingsj chemical database. It has the molecular formula C17H18FN3O3 and a molecular weight of 331.341 g/mol. Key properties include a melting point of 255-257°C, a boiling point of 581.8±50.0 °C at 760 mmHg, a density of 1.5±0.1 g/cm3 and a flash point of 305.6±30.1 °C. No supplier offers are currently listed; request a quote. Record last updated Aug 21, 2026.

CAS No.: 85721-33-1
Jingsj CID: J-47725-8
Molecular Formula: C₁₇H₁₈FN₃O₃
Molecular Weight: 331.341 g/mol
Category: Organic Compounds
Last updated: 8/21/2026

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Physicochemical Properties

Melting Point	255-257°C
Boiling Point	581.8±50.0 °C at 760 mmHg
Density	1.5±0.1 g/cm3
Flash Point	305.6±30.1 °C
Exact Mass	331.133209
PSA	74.57000
LogP	0.65
Vapor Pressure	0.0±1.7 mmHg at 25°C
Refractive Index	1.655

Activity & Biological Data

Additional Information	[1]. Peltzer PM, et al. Ecotoxicity of veterinary enrofloxacin and ciprofloxacin antibiotics on anuran amphibian larvae. Environ Toxicol Pharmacol. 2017 Feb 4. pii: S1382-6689(17)30029-7 [2]. Steenbergen J, et al. In Vitro and In Vivo Activity of Omadacycline Against Two Biothreat Pathogens: Bacillus anthracis and Yersinia pestis. Antimicrob Agents Chemother. 2017 Feb 21. [3]. Hamblin KA, et al. Inhaled Liposomal Ciprofloxacin Protects against a Lethal Infection in a Murine Model of Pneumonic Plague. Front Microbiol. 2017 Feb 6;8:91.

Additional Information

[1]. Peltzer PM, et al. Ecotoxicity of veterinary enrofloxacin and ciprofloxacin antibiotics on anuran amphibian larvae. Environ Toxicol Pharmacol. 2017 Feb 4. pii: S1382-6689(17)30029-7 [2]. Steenbergen J, et al. In Vitro and In Vivo Activity of Omadacycline Against Two Biothreat Pathogens: Bacillus anthracis and Yersinia pestis. Antimicrob Agents Chemother. 2017 Feb 21. [3]. Hamblin KA, et al. Inhaled Liposomal Ciprofloxacin Protects against a Lethal Infection in a Murine Model of Pneumonic Plague. Front Microbiol. 2017 Feb 6;8:91.

Customs & Trade Information

HS Code	3004909090

Frequently Asked Questions

What is the CAS number of Ciprofloxacin?

The CAS number of Ciprofloxacin is 85721-33-1.

What are the molecular formula and molecular weight of Ciprofloxacin?

Ciprofloxacin has molecular formula C17H18FN3O3 and molecular weight 331.341 g/mol.

What are the upstream and downstream products of Ciprofloxacin?

For Ciprofloxacin, Upstream Products: Piperazine, 7-Chloro-1-cyclopropyl-6-fluoro-1,4-dihydro-4-oxoquinoline-3-carboxylic acid, Dimethyl sulfoxide; Downstream Products: Ciprofloxacin Hydrochloride, 1-Cyclopropyl-6-fluoro-7-(4-formylpiperazin-1-yl)-4-oxo-1,4-dihydroquinoline-3-carboxylic acid, Decarboxy ciprofloxacin.

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. "Ciprofloxacin (CAS 85721-33-1)". Jingsj Chemical Database. https://www.jingsj.com/compound/J-47725-8 (accessed 2026-11-09).

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