Name Letrozole
Synonyms 4,4'-(1H-1,2,4-Triazol-1-ylmethylene)bisbenzonitrile
Molecular Formula C17H11N5
Molecular Weight 285.31
CAS NO: 112809-51-5
FM: C17H11N5
Supply from grams to commercial quantity
Appearance: white crystalline powder
USP 31
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Appearance
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White to Off-white crystalline powder
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Identification
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a) IR
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IR chromatograph Conforms to the characteristic peak of R.S.
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b) HPLC
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The retention time of the major peak in the chromatogram Conforms to the characteristic peak of R.S.
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Solubility
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Soluble in Dichloromethane, slightly soluble in Ethanol, practically insoluble in Water
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Residue on ignition
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Not more than 0.1%
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Water
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Not more than 0.3%
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Loss on drying
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Not more than0.5%
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Heavy Metals
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Not more than 10 ppm
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Ethyl acetate
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Not more than 0.5%
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