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  • industrial
  • pharma

4,4'-(1H-1,2,4-Triazol-1-ylmethylene)dibenzonitrile

CAS 112809-51-5

Also registered as 1 other CAS number

2189711-70-2

4,4'-(1H-1,2,4-Triazol-1-ylmethylene)dibenzonitrile chemical structure

Concern score

Not assessed — no hazard data yet.

4,4'-(1H-1,2,4-Triazol-1-ylmethylene)dibenzonitrile in plain language

What it is

Also known as Letrozole · 4,4'-(1H-1,2,4-Triazol-1-ylmethylene)bis · 4,4′-(1H-1,2,4-Triazol-1-ylmethylene)bis · 4,4'-(1H-1,2,4-triazol-1-yl-methylene)-bis(benzonitrile) · 4,4'-(1H-1,2,4triazol-1-ylmethylene)dibenzonitrile · 4,4′-(1H-1,2,4-Triazol-1-ylmethylene)dibenzonitrile

Show all 17 names

Benzonitrile, 4,4′-(1H-1,2,4-triazol-1-ylmethylene)bis- · CGS-20267 · CGS20267 · Femara · Femera · L02BG04 · Letrazole · Letrozol · Letrozole Tablets · letrozolum · Kisqali femara co-pack component letrozole

What it does

We don't have a plain-language description for 4,4'-(1H-1,2,4-Triazol-1-ylmethylene)dibenzonitrile yet.

Recorded functional uses: Pharmaceutical

Is it a concern?
We haven't assessed a concern score for this ingredient yet.

Regulation

No restrictions found. 4,4'-(1H-1,2,4-Triazol-1-ylmethylene)dibenzonitrile appears in these published regulatory listings.

  • In marketed US drugs

Recorded in these product areas

  • Found in consumer products
  • Industrial
  • USEPAcommercial use observedEPA CPDat observed this chemical in 0 composition records across product categories including unclassified products. EPA CPDat classifies this chemical for functional uses including Pharmaceutical.
    • EPA CPDat observed this chemical in 0 composition records across product categories including unclassified products. EPA CPDat classifies this chemical for functional uses including Pharmaceutical.Source →
  • USFDAlisted in openFDA substanceopenFDA substance registry classifies this ingredient as chemical.
    • openFDA substance registry classifies this ingredient as chemical.Source →
  • USFDAmarketed drug occurrenceFDA NDC lists this ingredient in 22 active drug products and 22 total products.
    • FDA NDC lists this ingredient in 22 active drug products and 22 total products.Source →

Evidence & sources

No graded research studies for 4,4'-(1H-1,2,4-Triazol-1-ylmethylene)dibenzonitrile yet. This record is compiled from the published data sources below — registries and regulatory listings, not study findings.

6 data sources

Where this comes from

  • EPA Chemical and Products Database

    exposure · updated 2020-08-31

    Open →

  • EPA DSSTox Identifiers

    chemistry · updated 2025-12-29

    Open →

  • FDA National Drug Code Directory

    regulatory · updated 2027-12-31

    Open →

  • FDA GSRS UNII

    registry · updated 2026-02-26

    Open →

  • openFDA Substance

    registry · updated 2026-05-24

    Open →

  • PubChem Live Enrichment

    chemistry · updated 2026-05-17

    Open →
Reference links (2)
Openfda substance

dailymed.nlm.nih.gov

Read →
Openfda substance

accessdata.fda.gov

Read →

Suitability

Context-specific fit derived from published classifications and the current ingredient evidence profile.

Fragrance avoidance

Nothing to weigh for this context yet.

No signal in this context

We have no published hazard signal for this ingredient, so we cannot say how it behaves in this context — that is missing evidence, not a clean result.

Where it has been recorded

How often FDA National Drug Code directory has listed 4,4'-(1H-1,2,4-Triazol-1-ylmethylene)dibenzonitrile in a product composition. These are source records, not Greenveil catalog products.

Source records

22

Typical roles

Pharmaceutical
See products using 4,4'-(1H-1,2,4-Triazol-1-ylmethylene)dibenzonitrile →