Vortioxetine (2,6-dimethyl phenyl)(2-nitrophenyl) sulfane

Vortioxetine (2,6-dimethyl phenyl)(2-nitrophenyl) sulfane is a sulfur-mediated aromatic coupling byproduct arising from the substitution of a 2-nitrophenyl moiety for the 3-fluoro-4-methoxyphenyl ring in the parent drug's structure. The compound features a central sulfane (S) bridge connecting a 2,6-dimethylphenyl group to a 2-nitrophenyl group, diverging from vortioxetine's fluorinated methoxy substitution. This impurity likely forms during cross-coupling steps via unintended nitration or aryl sulfide formation. It serves as a critical HPLC reference standard for detecting synthetic pathway deviations in vortioxetine API production.