vortioxetine 2[(3,4-dimethyl phenyl)sulfanyl] aniline

This compound is a structurally distinct impurity derived from vortioxetine, featuring a 3,4-dimethylphenyl sulfanyl group appended to the aniline core. The sulfur bridge links the dimethyl-substituted aromatic ring to the aniline moiety, diverging from the parent drug's tetrahydrofuran-based scaffold. Its unique substitution pattern and sulfide linkage arise from synthetic pathway deviations during vortioxetine production. This impurity serves as a critical HPLC reference standard for quantifying process-related impurities in vortioxetine active pharmaceutical ingredients.