C17H11N5
285.3 g/mol
APIDanger
Letrozole
CAS112809-51-5EC675-034-8
Category
API
Compound Class
Heterocycle
Primary Use
Pharmaceutical Raw Material
Letrozole is an active pharmaceutical ingredient used in the manufacturing of medications for postmenopausal breast cancer. It functions as an aromatase inhibitor, a class of compounds that play a role in endocrine therapy.
pharmaceutical raw material for aromatase inhibitor medicationscompound used in breast cancer therapy manufacturing
Content scope: Information here supports chemical identification and industrial supply, research, and manufacturing contexts. It is not a therapeutic claim, medical advice, or drug-use instructions.
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Related Compounds
ReferenceSame Category
4,4'-(1H-1,3,4-triazol-1-ylmethylene)dibenzonitrile
CAS112809-52-6
pharmaceutical raw material
ReferenceSame Category
Gatifloxacin
CAS112811-59-3
pharmaceutical raw material
ReferenceSame Category
1-Cyclopropyl-6,7-difluoro-1,4-dihydro-8-methoxy-4-oxo-3-quinolinecarboxylic acid ethyl ester
CAS112811-71-9
pharmaceutical raw material
ReferenceSame Category
24R-calcipotriol
CAS112827-99-3
pharmaceutical raw material
Safety Reference
Danger
H315Causes skin irritation
H319Causes serious eye irritation
H351Suspected of causing cancer
H360May damage fertility or the unborn child
H373May cause damage to organs through prolonged or repeated exposure
Customs Tariff Classification
The international HS code for Letrozole (CAS 112809-51-5) is 2933.99.
HS code (international, 6-digit)
2933.99
EU CN code (8-digit)
2933 99 80
Classification per the EU customs inventory ECICS (2026-07 snapshot, HS 2022). National tariff lines and product form can affect the final classification.
Identifiers
IUPAC Name
4-[(4-cyanophenyl)-(1,2,4-triazol-1-yl)methyl]benzonitrile
InChIKey
HPJKCIUCZWXJDR-UHFFFAOYSA-N
SMILES
C1=CC(=CC=C1C#N)C(C2=CC=C(C=C2)C#N)N3C=NC=N3
Synonyms (31)
- Letrozole (JAN/USP/INN)
- Letrozole, European Pharmacopoeia (EP)
- Letrozole, United States Pharmacopeia (USP)
- Femara
- Femara (TN)
- Femara (TN) (Novartis)
- Femara, Letrozole
- LETROZOLE [MART.]
- Letoval
- Letrozol
- Letrozole (Standard)
- Letrozole - Bio-X trade mark
- Letrozole CRS
- Letrozole Tablets
- Letrozole, >=98% (HPLC)
- letrozole
- letrozolum
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