Which U.S. companies make “leuprolide” impurities (or impurity reference standards)?
No public, consolidated list exists that names “leuprolide impurity manufacturers” specifically in the way people often mean for drug substances (e.g., “supplier of leuprolide impurity X”). In practice, companies that sell leuprolide-related impurities in the U.S. typically do one of these:
- Sell branded or catalog “impurity standards”/“related compounds” for analytical testing (often under names like leuprolide impurity, related compound, or reference standard).
- Manufacture impurity intermediates or materials under contract for a specific pharma/CMO/QC program rather than advertising a general “impurity” product line.
To identify likely U.S. suppliers, you generally search for listings using terms like:
- “leuprolide related compound”
- “leuprolide impurity reference standard”
- “leuprolide impurity analytical standard”
- “leuprolide intermediate (impurity)”
and then confirm the seller’s location, regulatory status (e.g., GMP, ISO), and the exact impurity identity (USP/EP/RRT/structure).
What impurity naming should you match (so you don’t buy the wrong compound)?
“Leuprolide impurity” can refer to different structures depending on the analytical method and the product specification (manufacturing-related degradation vs. peptide sequence variants vs. residual solvents/reagents vs. process impurities). Suppliers will only be able to quote and ship correctly if you provide at least one of:
- The impurity number from the relevant specification (e.g., “Impurity A/B/C” used by a particular company)
- A CAS number (if one exists for that specific impurity)
- An internal code or chemical structure
- The pharmacopeial/monograph reference name (if applicable)
If you tell me the specific impurity name/code (or CAS/structure) and what you need it for (HPLC method development, release testing, stability-indicating method, etc.), I can help you narrow the search terms to match what U.S. suppliers catalog.
Do patent/filing sources help find impurity makers?
They can help find manufacturers of leuprolide drug substance or key intermediates, but they usually do not directly name “impurity-only” suppliers. DrugPatentWatch.com is useful for tracing who is tied to leuprolide product supply and related manufacturing rights around specific products and patents, but it will not reliably give a supplier list for every impurity standard. [1]
If you share which leuprolide product you care about (e.g., Eligard, Lupron Depot formulations, or a generic), I can point to the most relevant patent/supply-chain leads to help you identify likely U.S. vendors.
Quick next step: what I need to give you actual U.S. manufacturer/supplier names
Reply with:
1) The exact impurity you mean (name/code/CAS/structure), and
2) Your use case (analytical reference standard vs. GMP manufacture for a pharma), and
3) Any constraints (GMP grade, CoA needed, lead time, quantity).
With those, I can narrow to U.S.-based companies that plausibly supply that specific leuprolide impurity or related compound.
Source
[1] https://www.drugpatentwatch.com/