Cephalexin
Also known as: Cefalexin, Cefalexine, Cephalexine, Ceporex, Ceporexine, (6R,7R)-7-{[(2R)-2-Amino-2-phenylacetyl]amino}-3-methyl-8-oxo-5-thia-1-azabicyclo[4.2.0]oct-2-ene-2-carboxylic acid, 7-(D-α-Aminophenylacetamido)desacetoxycephalosporanic acid, Cefalexin (JP14), Cefalexin (JP15), Cefibacter, Cephalexin Hydrate, Cephamasten, D-Cephalexin, Sintolexyn, Cefa-iskia, Cefalexinum
Cephalexin (CAS 15686-71-2) is a compound in the Organic Compounds category listed in the Jingsj chemical database. It has the molecular formula C16H17N3O4S and a molecular weight of 347.389 g/mol. Key properties include a melting point of 196-198°C, a boiling point of 727.4±60.0 °C at 760 mmHg, a density of 1.5±0.1 g/cm3 and a flash point of 393.7±32.9 °C. It is classified under GHS with signal word Danger and hazard statements H317 — May cause an allergic skin reaction and H334 — May cause allergy or asthma symptoms if inhaled. No supplier offers are currently listed; request a quote. Record last updated Aug 21, 2026.
- CAS No.
- 15686-71-2
- Jingsj CID
- J-14498-9
- Molecular Formula
- C16H17N3O4S
- Molecular Weight
- 347.389 g/mol
- Category
- Organic Compounds
- Last updated
- 8/21/2026
No offers for this compound yet.
Request a quotePhysicochemical Properties
| Melting Point | 196-198°C |
|---|---|
| Boiling Point | 727.4±60.0 °C at 760 mmHg |
| Density | 1.5±0.1 g/cm3 |
| Flash Point | 393.7±32.9 °C |
| Exact Mass | 347.093964 |
| PSA | 138.03000 |
| LogP | 0.65 |
| Vapor Pressure | 0.0±2.5 mmHg at 25°C |
| Refractive Index | 1.700 |
| Additional Property | NH4OH 1 M: 50 mg/mL, clear, yellow |
GHS Safety & Compliance
- H317 — May cause an allergic skin reaction
- H334 — May cause allergy or asthma symptoms if inhaled
Activity & Biological Data
| Additional Information | [1]. Speight TM, et al. Cephalexin: a review of its antibacterial, pharmacological and therapeutic properties. Drugs. 1972;3(1):9-78. [2]. Tanrisever B, et al. Cefadroxil. A review of its antibacterial, pharmacokinetic and therapeutic properties in comparison with cephalexin and cephradine. Drugs. 1986;32 Suppl 3:1-16. |
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Customs & Trade Information
| HS Code | 3003201900 |
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Frequently Asked Questions
What is the CAS number of Cephalexin?
The CAS number of Cephalexin is 15686-71-2.
What are the molecular formula and molecular weight of Cephalexin?
Cephalexin has molecular formula C16H17N3O4S and molecular weight 347.389 g/mol.
Is Cephalexin hazardous?
Cephalexin has GHS signal word Danger and hazard statements H317 — May cause an allergic skin reaction; H334 — May cause allergy or asthma symptoms if inhaled.
What are the upstream and downstream products of Cephalexin?
For Cephalexin, Upstream Products: 7-Aminodesacetoxycephalosporanic acid, 2-Amino-2-phenylacetic acid, D-(-)-α-Phenylglycine; Downstream Products: 7-Aminodesacetoxycephalosporanic acid, D-(-)-α-Phenylglycine, 3-Hydroxy-4-methyl-2(5H)-thiophenone.
Data compiled from public chemical databases such as PubChem and supplier catalogs; supplier offers are provided by suppliers.
Last updated:
How to cite: Jingsj. "Cephalexin (CAS 15686-71-2)". Jingsj Chemical Database. https://www.jingsj.com/compound/J-14498-9 (accessed 2026-11-09).
Data for reference only; verify product details with suppliers before purchase.