Chlorphenamine Impurity C

Chlorphenamine Impurity C is a synthetic byproduct arising from incomplete N-methylation during the synthesis of the parent antihistamine. Its structure features a 4-chloro-α-phenylbenzeneethanamine scaffold with a mono-N-methylated amine group, distinguishing it from the fully N,N-dimethylated chlorphenamine. The compound retains the core aromatic and aliphatic moieties but lacks one methyl group on the terminal amine, leading to altered physicochemical properties. This impurity serves as a critical HPLC reference standard for quantifying process-related deviations in chlorphenamine manufacturing.