Letrozole and intermediates

Letrozole （femara）[Chemical Name]: 4, 4'-(1H-1, 2, 4-triazol-1-ylmethylene) bis-Benzonitrile [Molecule]: C17H11N5[Molecular weight]: 285.10[CAS]: [Specification]:Appearance White or off-white crystalline powder Assay ≥99.0% Related Substance ≤0.3% Single Impurty ≤0.1% Loss On Drying ≤0.5%Intermediate of Letrozole [Chemical Name]: 4-[1-(1, 2, 4-triazolyl)-methyl]-benzonitrile [CAS NO. ]: [Chemical Name]: 4, 4'-Dicyanobenzophenone(intermediate of letrozole ) [CAS NO. ]: 32445-66-5 [Chemical Name]: 4-[α-(4-cyanophenyl)-hydroxymethyl]-benzonitrile [CAS NO. ]: [Chemical Name]: 4-[α-(4-cyanophenyl)-chloromethyl]-benzonitrile [CAS NO. ]: [Impurity]: 4,4’,4”-methylidenetrisbenzonitrile CAS NO. []

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