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Cromolyn impurities and related standards

Cromolyn is held here as a working collection of 12 reference materials across 2 CAS numbers. Within the range, numbered impurities go up to 3. 5 of the entries are impurity-type materials of the parent, 3 are salt or counter-ion variants and 1 carry a deuterium label. 2 entries carry a verified structure drawing, a coverage of 17%; the rest are listed without a structure rather than with an unverified one. 2 of them sit in tier A or B, meaning the data behind the page is complete enough to be indexed and quoted directly, while 10 remain tier C and are kept for search coverage. Because these are degradation and process impurities of a single parent, the useful comparison between suppliers is not the headline count but which letters are actually covered and whether each one arrives with a structure and a stated content basis. Where the impurity is a chiral species, the enantiomeric ratio belongs on the specification alongside the chemical purity, because an achiral method reports the two together as one peak.

Sources: DailyMed (US NLM) - CROMOLYN SODIUM SOLUTION/ DROPS [A-S MEDICATION SOLUTIONS].

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

In this group: 2 fine chemicals · 1 impurity reference standard · 1 general reference standard. CAS numbers are listed for 4 of 4; 4 entries carry a structure drawing.

On this page

4 reference standards

All entries — structure, identifiers and pack sizes

4 reference standards

Frequently asked

How many Cromolyn-related reference standards do you hold?
4 standards are listed on this page as of the latest catalogue build. CAS numbers are published for 4 of them and 4 entries carry a structure drawing. The catalogue is extended as new lots are released.
Can you supply a Cromolyn 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 Cromolyn 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 Cromolyn 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.