Oxacillin

Also known as: (2S,5R,6R)-3,3-Dimethyl-6-[(5-methyl-3-phenyl-4-isoxazolyl)carbonylamino]-7-oxo-4-thia-1-azabicyclo[3.2.0]heptane-2-carboxylic acid, Bactocil, Penstapho, Prostaphlin

Oxacillin (CAS 66-79-5) is a compound in the Aromatic Hydrocarbons category listed in the Jingsj chemical database. It has the molecular formula C19H19N3O5S and a molecular weight of 401.43600 g/mol. Key property: a melting point of 188ºC. No supplier offers are currently listed; request a quote. Record last updated Aug 21, 2026.

CAS No.: 66-79-5
Jingsj CID: J-1984916-8
Molecular Formula: C₁₉H₁₉N₃O₅S
Molecular Weight: 401.43600 g/mol
Category: Aromatic Hydrocarbons
Last updated: 8/21/2026

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Physicochemical Properties

Melting Point	188ºC
Exact Mass	401.10500
PSA	138.04000
LogP	2.22410

Frequently Asked Questions

What is the CAS number of Oxacillin?

The CAS number of Oxacillin is 66-79-5.

What are the molecular formula and molecular weight of Oxacillin?

Oxacillin has molecular formula C19H19N3O5S and molecular weight 401.43600 g/mol.

What are the upstream and downstream products of Oxacillin?

For Oxacillin, Upstream Products: 6-Aminopenicillanic acid, 5-Methyl-3-phenylisoxazole-4-carbonyl chloride.

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. "Oxacillin (CAS 66-79-5)". Jingsj Chemical Database. https://www.jingsj.com/compound/J-1984916-8 (accessed 2026-11-06).

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