Cefalexin impurities and related standards

8 reference standards related to Cefalexin held in the RSSE catalogue — pharmacopoeial impurities, non-compendial impurities, metabolites and labelled analogues where available.

CAS numbers are listed for 8 of 8; 7 entries carry a structure drawing.

Cefalexin — related standards
Compound	CAS No.	Catalogue No.	Formula	MW
Cefalexin impurity E	146794-70-9	RS-C143002	C13H18N2O4S	298.36
Cefalexin Impurity B	22252-43-3	RS-C143003	C8H10N2O3S	214.24
Cefalexin impurity A	2835-06-5	RS-C143004	C8H9NO2	151.16
Cefalexin impurity L	34632-04-7	RS-C143005	C16H17N3O4S	347.39
Cefalexin impurity J	56193-21-6	RS-C143006	C16H17N3O5S	363.39
Cefalexin impurity C	72528-40-6	RS-C143007	C24H24N4O5S	480.54
Cefalexin EP Impurity F	79750-46-2	RS-C143008	C16H17N3O4S	347.4
Cefalexin Impurity 14	1323247-65-9	RS-C143001	C16H19N3O5S	365.4

Structures

Cefalexin impurity E

CAS 146794-70-9RS-C143002
COA per lot
Cefalexin Impurity B

CAS 22252-43-3RS-C143003
COA per lot
Cefalexin impurity A

CAS 2835-06-5RS-C143004
COA per lot
Cefalexin impurity L

CAS 34632-04-7RS-C143005
COA per lot
Cefalexin impurity J

CAS 56193-21-6RS-C143006
COA per lot
Cefalexin impurity C

CAS 72528-40-6RS-C143007
COA per lot
Cefalexin EP Impurity F

CAS 79750-46-2RS-C143008
COA per lot
Cefalexin Impurity 14

CAS 1323247-65-9RS-C143001
COA per lot

Frequently asked

How many Cefalexin-related reference standards do you hold?

8 standards are listed on this page as of the latest catalogue build. CAS numbers are published for 8 of them and 7 entries carry a structure drawing. The catalogue is extended as new lots are released.

Can you supply a Cefalexin impurity that is not listed here?

Yes. Non-compendial impurities can be quoted from a structure — a CAS number is not required. Send the structure, a SMILES string or the parent drug substance with your enquiry and we will come back with availability.

What documentation is supplied with Cefalexin impurities?

Every lot ships with its own certificate of analysis. The certificate records the catalogue number, the batch number, the tests performed, the specification applied and the result obtained for that lot. A safety data sheet is supplied with the shipment.

Do you publish prices or a lead time for Cefalexin impurities?

No price list is published: quotations are prepared per enquiry, because availability and packing depend on the lot and the quantity you need. Send the catalogue number and the quantity and a technical contact will answer with availability and a quotation.

Cannot find the impurity you need? Non-compendial impurities can be quoted from a structure — a CAS number is not required. Write to sales@rssechem.com.