Letrozole impurities and related standards
5 reference standards related to Letrozole held in the RSSE catalogue — pharmacopoeial impurities, non-compendial impurities, metabolites and labelled analogues where available.
CAS numbers are listed for 5 of 5; 4 entries carry a structure drawing.
| Compound | CAS No. | Catalogue No. | Formula | MW |
|---|---|---|---|---|
| Letrozole EP Impurity A | 112809-52-6 | RS-L036002 | C17H11N5 | 285.3 |
| Letrozole EP Impurity B | 113402-31-6 | RS-L036003 | C22H13N3 | 319.36 |
| Letrozole Impurity 6 | 123-56-8 | RS-L036004 | C4H5NO2 | 99.09 |
| Letrozole Impurity 1 | 143030-54-0 | RS-L036005 | C16H11BrN4 | 339.2 |
| Letrozole Impurity 3 | 112809-25-3 | RS-L036001 | C10H8N4 | 184.2 |
Structures
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Letrozole EP Impurity A
COA per lot -
Letrozole EP Impurity B
COA per lot -
Letrozole Impurity 6
COA per lot -
Letrozole Impurity 1
COA per lot -
Letrozole Impurity 3
COA per lot
Frequently asked
How many Letrozole-related reference standards do you hold?
5 standards are listed on this page as of the latest catalogue build. CAS numbers are published for 5 of them and 4 entries carry a structure drawing. The catalogue is extended as new lots are released.
Can you supply a Letrozole 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 Letrozole 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 Letrozole 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 [email protected].