Reference Standards for Scientific Excellence
Impurity and isotope-labelled reference standards, documented lot by lot.
RSSE supplies the compounds analytical laboratories actually need — pharmacopoeial impurities, non-compendial degradants, metabolites, nitrosamines and stable isotope-labelled internal standards. Every lot ships with its own certificate of analysis.
Each figure has its own basis: 18,851 product records are held, of which 15,763 are published and open to search engines; 15,763 carry a structure drawing, and 1,570 drug substances are covered (counted over the published entries).
Featured reference standards
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Ampicillin EP Impurity I
COA per lot -
Diquafosol Impurity 8
COA per lot -
Ceftazidime Impurity A
COA per lot -
Dapoxetine Impurity 77
COA per lot
Standards by type
The same catalogue, grouped the way methods are written — by the kind of standard a laboratory needs.
Find every impurity of one drug substance
Most enquiries arrive as “do you have the full set for this API?”. Each hub lists the impurities, metabolites and labelled analogues we hold for that drug substance.
Three steps, no account needed
1 · Send the CAS number
Plus the pack size and quantity you need. A structure, a SMILES string or the parent drug substance also works.
2 · We confirm availability
Stock or lead time, documentation, shipping conditions and the lot-specific COA.
3 · You receive a written quotation
Enquiries reach a technical contact, not a ticket queue: sales@rssechem.com.
In stock or on synthesis
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Ampicillin EP Impurity I
COA per lot -
Diquafosol Impurity 8
COA per lot -
Ceftazidime Impurity A
COA per lot -
Dapoxetine Impurity 77
COA per lot -
Alogliptin Impurity D
COA per lot -
Methylthiouracil Impurity 16
COA per lot -
Cobicistat Impurity 1
COA per lot -
Cinacalcet impurity 72
COA per lot
What you get with every lot
A certificate that identifies the lot
Certificates are issued per batch and reference the analytical data used to assign content or purity, so the document you file matches the vial you received.
Compounds that are genuinely hard to source
Nitrosamines, genotoxic impurities, deuterated and 13C internal standards, metabolites and toxins — the items that usually stall a method validation.
No account required. We do not publish prices and registration does not unlock a price list — quotations are per enquiry.
Send us a CAS number
Availability, documentation and lead time — answered by the people who handle the batch.