Promethazine impurity 55 CAS CATO-C4X-141855

Purity 97%+In StockPharmacopoeial Impurity Standards
CAS No.CATO-C4X-141855
Molecular FormulaC16H17N3OS
Molecular Weight299.39 g/mol
CategoryPharmacopoeial Impurity Standards / EP Impurities
AvailabilityIn Stock

Chemical Structure

Promethazine impurity 55 CAS CATO-C4X-141855 chemical structure

Description

The molecular framework of Promethazine impurity 55 (C16H17N3OS) is characterized by a nitrogen-containing heterocyclic scaffold, an amide group, sulfur-containing functionality, a hydroxyl group, an ether linkage. In reversed-phase chromatography, its retention is governed primarily by its high hydrophobicity (logP), which provides a practical basis for HPLC-UV/DAD or LC-MS method development. Nitrogen-containing functional groups confer excellent ionization efficiency in positive-ion electrospray (ESI) mode, making the compound well suited to LC-MS/MS analysis.

Promethazine impurity 55 (CAS CATO-C4X-141855) is a certified pharmaceutical impurity reference standard with the molecular formula C16H17N3OS and a molecular weight of 299.39 g/mol.

This reference standard supports related-substances testing and method development in line with ICH Q3A/Q3B guidance on impurity control, and is suitable for system suitability testing and forced-degradation studies.

As a certified reference material (CRM), Promethazine impurity 55 meets the metrological traceability requirements of ISO/IEC 17025 laboratories. Batch-to-batch consistency is monitored via control charts to guarantee comparable assigned values across lots.

Physical & Chemical Properties

Molecular FormulaC16H17N3OS
Molecular Weight299.39 g/mol
Purity97%+
StorageStore at 2-8°C, protect from light
Solubility (reference)Soluble in DMSO, DMF, methanol
StabilityLight-sensitive; avoid direct strong light
Degree of Unsaturation (DBE)10.0
UV AbsorptionUV-absorbing
Structural FeaturesAromatic ring present
Nitrogen Atoms3
Sulfur Atoms1

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