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Cyclobenzaprine impurities and related standards

Cyclobenzaprine is held here as a working collection of 46 reference materials across 19 CAS numbers. Within the range, 1 USP-designated impurities are named explicitly. 14 of the entries are impurity-type materials of the parent, 7 are salt or counter-ion variants and 15 carry a deuterium label and 5 are nitrosamine analogues. 17 entries carry a verified structure drawing, a coverage of 37%; the rest are listed without a structure rather than with an unverified one. 17 of them sit in tier A or B, meaning the data behind the page is complete enough to be indexed and quoted directly, while 29 remain tier C and are kept for search coverage. The labelled members of this group are used as internal standards, which puts the isotopic distribution at the centre of the specification rather than at its edge: the label position and the enrichment have to be stated, and a co-eluting unlabelled fraction changes the result even when the chemical purity looks acceptable. The mass balance check is the step most often skipped: the sum of the parent assay and the specified impurities should account for the sample, and a series that is incomplete makes that sum look better than it is.

Sources: DailyMed (US NLM) - CYCLOBENZAPRINE HYDROCHLORIDE TABLET, FILM COATED [AIPING PHARMACEUTICAL, INC.].

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

In this group: 6 stable isotope labelled standards · 4 impurity reference standards · 4 fine chemicals · 1 general reference standard. CAS numbers are listed for 17 of 17; 17 entries carry a structure drawing.

On this page

17 reference standards

All entries — structure, identifiers and pack sizes

17 reference standards

Frequently asked

How many Cyclobenzaprine-related reference standards do you hold?
17 standards are listed on this page as of the latest catalogue build. CAS numbers are published for 17 of them and 17 entries carry a structure drawing. The catalogue is extended as new lots are released.
Can you supply a Cyclobenzaprine 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 Cyclobenzaprine 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 Cyclobenzaprine 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.