Niclosamide Impurity 4 CAS 16739-21-2

Purity >95%In StockPharmacopoeial Impurity Standards
CAS No.16739-21-2
Molecular FormulaC13H7Cl3N2O4
Molecular Weight361.56 g/mol
CategoryPharmacopoeial Impurity Standards / EP Impurities
AvailabilityIn Stock

Chemical Structure

Niclosamide Impurity 4 CAS 16739-21-2 chemical structure

Description

CATO supplies Niclosamide Impurity 4 (CAS 16739-21-2), a pharmacopoeial impurity standards reference standard manufactured under ISO 17034 accreditation. Molecular formula: C13H7Cl3N2O4. Molecular weight: 361.56 g/mol. Batch-specific COA and technical support are available on request.

Physical & Chemical Properties

Molecular FormulaC13H7Cl3N2O4
Molecular Weight361.56 g/mol
AppearancePale yellow to yellow crystalline powder. (slight halide-like odor, low volatility)
Purity>95%
StorageStore at 2-8°C, protect from light, keep sealed and dry
Solubility (reference)Soluble in DMSO, DMF, methanol
StabilityMay oxidize slowly on prolonged air exposure; Light-sensitive; avoid direct strong light; Hygroscopic; reseal immediately after opening; Contains ester bond; hydrolyzes under strong alkaline conditions
Degree of Unsaturation (DBE)10.0
UV AbsorptionUV-absorbing
Structural FeaturesAromatic ring present
CAS Registry Year (est.)1961
Halogen ContentCl-containing
Nitrogen Atoms2

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