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Thyroxine impurities and related standards

Thyroxine is held here as a working collection of 9 reference materials across 3 CAS numbers. 1 of the entries are impurity-type materials of the parent, 2 are salt or counter-ion variants. 3 entries carry a verified structure drawing, a coverage of 33%; the rest are listed without a structure rather than with an unverified one. 3 of them sit in tier A or B, meaning the data behind the page is complete enough to be indexed and quoted directly, while 6 remain tier C and are kept for search coverage. These are commodity chemistry rather than a drug impurity series, which changes what a buyer should check. The identity is usually straightforward; what varies between suppliers is the trace profile and the water content, and both of those show up in a specification rather than on a chromatogram. Because the group spans many small related compounds rather than one parent, the practical question for a buyer is which members are held at all: a route scouting exercise usually needs a handful of specific analogues, not the whole shelf.

Sources: DailyMed (US NLM) - THYROXINE CORD (LEVOTHYROXINUM) LIQUID [ENERGIQUE, INC.].

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

In this group: 2 fine chemicals · 2 stable isotope labelled standards. 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 Thyroxine-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 Thyroxine 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 Thyroxine 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 Thyroxine 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.