An Analytical Reference Standard
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Parent Compound(s)
11568Letrozole
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4,4'-Dicyanobenzhydrol

Item No. 21316

Product Insert (PDF)GC-MS (PDF)Safety Data Sheet (SDS) (PDF)
Synonyms
Synonyms
  • bis-(4-Cyanophenyl)methanol
  • bis(p-Cyanophenyl)methanol
  • CGP 44,645
Technical Information
Formal Name
4,4'-(hydroxymethylene)bis-benzonitrile
CAS Number
134521-16-7
Molecular Formula
C15H10N2O
Formula Weight
234.3
Purity
≥98%
Formulation
A crystalline solid
Solubility(Learn about Variance in Solubility)
DMF: 30 mg/mLDMF:PBS (pH 7.2) (1:5): 0.16 mg/mLDMSO: 12.5 mg/mLEthanol: 25mg/mL
λmax
242 nm
SMILES
OC(C1=CC=C(C#N)C=C1)C2=CC=C(C#N)C=C2
InChi Code
InChI=1S/C15H10N2O/c16-9-11-1-5-13(6-2-11)15(18)14-7-3-12(10-17)4-8-14/h1-8,15,18H
InChi Key
JNJWXPZHWUOYRZ-UHFFFAOYSA-N
Shipping & Storage Information
Storage
-20°C
Shipping
Room temperature in continental US; may vary elsewhere
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    Product Description

    4,4'-Dicyanobenzhydrol (Item No. 21316) is an analytical reference standard that is a metabolite of letrozole (Item No. 11568), an aromatase inhibitor that has been abused during sports doping cycles to reduce gynecomastia associated with androgen abuse.1 4,4'-Dicyanobenzhydrol has been used as a marker of letrozole use in athletes. This product is intended for research and forensic applications.

    WARNING This product is not for human or veterinary use.

    References & Product Citations
    Product Description References

    1. Vari, C.-E., Osz, B.-E., Miklos, A., et al. Aromatase inhibitors in men – off-label use, misuse, abuse and doping. Farmacia 64(4), 813-818 (2016).