Molekula
Letrozole
Supplying 4,500+ customers in over 80 countries
ISO 9001:2015 & ISO 14001:2015 certified · Supplying laboratories and industry since 1999 · Listed pack sizes are a starting point — we manufacture, source and repack to the quantity you need
Letrozole is a nonsteroidal aromatase inhibitor primarily used in the treatment of hormone receptor-positive breast cancer in postmenopausal women. It works by reducing estrogen production, slowing tumor growth. This chemical has a CAS number of 112809-51-5, with a molecular formula of C17H11N5 and a molecular weight of 285.30 g/mol. It must be stored between 2 to 8°C and is classified with a signal word of "Danger." Molekula supplies Letrozole from research to bulk quantities with full documentation and ISO 9001:2015 traceability.
Example image for illustration only. Other packaging and pack sizes are available.
Pricing & pack sizes
On backorder — expected to ship by 18 November 2026
These pack sizes aren't a limit. Molekula manufactures, sources and repacks to order — if you need 500 kg and only see 1 kg listed, . We quote from grams to multi-tonne.
Need a different size? Add the nearest pack and change the size in your basket — we price it at the same rate per unit.
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1 g — $58.70 per pack
Need a different quantity or pack?
Tell us how much you need and when — drums, IBCs, sacks or a one-off bulk lot. We'll manufacture or source it and come back with a price.
Prices exclude VAT/sales tax and shipping.
Specifications
| Property | Value |
|---|---|
| Appearance | White powder |
| Water | ≤0.5% |
| Assay | ≥99.0% |
| Residue on Ignition | ≤0.2% |
| Identification (IR) | Conforms to reference |
Storage & handling
| Property | Value |
|---|---|
| Storage Temperature | 2 to 8 °C |
| Acidity | Neutral |
Literature values
Published physical properties of the substance, not batch specifications.
| Property | Value |
|---|---|
| Appearance | White to yellowish crystalline powder |
| Odour | Practically odorless |
| Melting Point | 181-183 °C |
| Solubility (other solvents) | Freely soluble in dichloromethane; slightly soluble in ethanol; practically insoluble in water |
Source: PubChem CID 3902 (HSDB)
Identification
| Property | Value |
|---|---|
| SKU | 36941533 |
| CAS Number | 112809-51-5 |
| IUPAC Name | 4-[(4-cyanophenyl)-(1,2,4-triazol-1-yl)methyl]benzonitrile |
| Molecular Formula | C17H11N5 |
| Molecular Weight | 285.30 |
| Exact Mass | 285.1014 |
| SMILES | C1=CC(=CC=C1C#N)C(C2=CC=C(C=C2)C#N)N3C=NC=N3 |
| InChIKey | HPJKCIUCZWXJDR-UHFFFAOYSA-N |
| InChI | InChI=1S/C17H11N5/c18-9-13-1-5-15(6-2-13)17(22-12-20-11-21-22)16-7-3-14(10-19)4-8-16/h1-8,11-12,17H |
| PubChem CID | 3902 |
| REACH Code | Y110 |
| HTS Code | 29339922 |
| Tariff Code | 2933998090 |
Safety & GHS
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Serious Health Hazard
GHS08
Hazard statements
- H341 Suspected of causing genetic defects
- H351 Suspected of causing cancer
- H360FD May damage fertility. May damage the unborn child.
- H362 May cause harm to breast-fed children
- H373 May cause damage to organs through prolonged or repeated exposure
Precautionary statements
- P201 Obtain special instructions before use
- P263 Avoid contact during pregnancy/while nursing
- P280 Wear protective gloves/protective clothing/eye protection/face protection
- P308+313 IF exposed or concerned: Get medical advice/attention
Documents
Safety Data Sheets (SDS)
Available in English, English (US), French, German, Italian, Portuguese, Spanish.
Certificate of Analysis (CoA) by batch
Enter a lot or batch number to retrieve the CoA for that specific batch. We can generate one from spec data if no PDF is on file.
Synonyms
- 4-((4-cyanophenyl)(1H-1,2,4-triazol-1-yl)methyl)benzonitrile
- 4-[(4-cyanophenyl)-(1,2,4-triazol-1-yl)methyl]benzonitrile
- 4,4'-(1H-1,2,4-Triazol-1-ylmethylene)dibenzonitrile
- Benzonitrile, 4,4'-(1H-1,2,4-triazol-1-ylmethylene)bis-
- CGS 20267
- Femara
- KISQALI FEMARA CO-PACK COMPONENT LETROZOLE
- Letrozol
- Letrozole Tablets
- letrozolum
Frequently asked questions
What is Letrozole commonly used for?
Letrozole is primarily used as a nonsteroidal aromatase inhibitor in the treatment of hormone receptor-positive breast cancer in postmenopausal women.
What is the chemical formula and molecular weight of Letrozole?
The chemical formula is **C17H11N5** and the molecular weight is **285.30 g/mol**.
What safety classification does Letrozole have?
Letrozole is classified with the **Signal Word: Danger** due to its hazardous properties.
How should Letrozole be stored?
Store Letrozole at **2 to 8°C** in a cool, dry place, protected from light and moisture.
Does Molekula supply Letrozole in bulk quantities?
Yes, Molekula can supply Letrozole in bulk, with quantities tailored to your research or production needs.
What documentation comes with a Letrozole order?
Each order includes a **Certificate of Analysis (CoA)**, Material Safety Data Sheet (MSDS), and a product specification sheet.
Ready to order or need a custom pack?
Tell us the product, grade, and quantity — Molekula usually responds within one working day with pricing and lead time.