N-desmethyl Venalafaxine.HCl

N-Desmethyl Venalafaxine.HCl is a structurally related impurity derived from Venlafaxine via N-demethylation of the tertiary amine moiety. The compound retains the core 3-(amino)-1-(4-methylphenoxy)-3-methylpropan-1-ol scaffold, featuring a protonated secondary amine in its hydrochloride salt form. The aromatic ether linkage and methyl substitution on the phenoxy ring remain intact, while the desmethylated nitrogen introduces a distinct electrophilic character compared to the parent drug. This impurity arises during synthetic pathways or degradation processes, necessitating its quantification in pharmaceutical development. It serves as a critical HPLC reference standard for impurity profiling in Venlafaxine-based formulations.