Cloxacillin sodium

Also known as: Cloxacillin sodium salt, Sodium cloxacillin, Cloxacillin sodium monohydrate, Tegopen, Orbenin, Cloxapen, Ankerbin, Austrastaph, Staphybiotic, Sodium cloxacillin monohydrate, Cloxacillin sodium salt hydrate

Cloxacillin sodium (CAS 642-78-4) is a compound in the Organohalogen Compounds category listed in the Jingsj chemical database. It has the molecular formula C19H17ClN3NaO5S and a molecular weight of 457.86900 g/mol. Key property: a melting point of 170ºC. No supplier offers are currently listed; request a quote. Record last updated Nov 2, 2026.

CAS No.: 642-78-4
Jingsj CID: J-1972477-7
Molecular Formula: C₁₉H₁₇ClN₃NaO₅S
Molecular Weight: 457.86900 g/mol
Category: Organohalogen Compounds
Last updated: 11/2/2026

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Physicochemical Properties

Melting Point	170ºC
Exact Mass	475.058075
PSA	140.87000
LogP	1.54280
Storage Conditions	2-8°C
Stability	Stable. Incompatible with strong oxidizing agents. Refrigerate.
Additional Property	H2O: 50 mg/mL, clear, colorless

Activity & Biological Data

Additional Information	[1]. J C Anderson, et al. The Effect of Incorporation of Cloxacillin in Liposomes on Treatment of Experimental Staphylococcal Mastitis in Mice. J Vet Pharmacol Ther. 1986 Sep;9(3):303-9. [2]. W Calame, et al. Influence of Etoposide and Cyclophosphamide on the Efficacy of Cloxacillin and Erythromycin in an Experimental Staphylococcal Infection. Antimicrob Agents Chemother. 1989 Jun;33(6):980-2. [3]. Peter H Nibbering, et al. 99mTc-Labeled UBI 29-41 Peptide for Monitoring the Efficacy of Antibacterial Agents in Mice Infected With Staphylococcus Aureus. J Nucl Med. 2004 Feb;45(2):321-6.

Additional Information

[1]. J C Anderson, et al. The Effect of Incorporation of Cloxacillin in Liposomes on Treatment of Experimental Staphylococcal Mastitis in Mice. J Vet Pharmacol Ther. 1986 Sep;9(3):303-9. [2]. W Calame, et al. Influence of Etoposide and Cyclophosphamide on the Efficacy of Cloxacillin and Erythromycin in an Experimental Staphylococcal Infection. Antimicrob Agents Chemother. 1989 Jun;33(6):980-2. [3]. Peter H Nibbering, et al. 99mTc-Labeled UBI 29-41 Peptide for Monitoring the Efficacy of Antibacterial Agents in Mice Infected With Staphylococcus Aureus. J Nucl Med. 2004 Feb;45(2):321-6.

Customs & Trade Information

HS Code	2941109900

Frequently Asked Questions

What is the CAS number of Cloxacillin sodium?

The CAS number of Cloxacillin sodium is 642-78-4.

What are the molecular formula and molecular weight of Cloxacillin sodium?

Cloxacillin sodium has molecular formula C19H17ClN3NaO5S and molecular weight 457.86900 g/mol.

What are the upstream and downstream products of Cloxacillin sodium?

For Cloxacillin sodium, Upstream Products: 6-Aminopenicillanic acid, 3-(2-Chlorophenyl)-5-methylisoxazole-4-carbonyl chloride, 2-Chlorobenzaldehyde.

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

Last updated: 11/2/2026

How to cite: Jingsj. "Cloxacillin sodium (CAS 642-78-4)". Jingsj Chemical Database. https://www.jingsj.com/compound/J-1972477-7 (accessed 2026-11-07).

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