La impureza C del ácido alfa lipoico, también denominada impureza 4 del ácido tióctico, es una impureza relacionada con el proceso y rica en azufre, asociada al esqueleto del ácido alfa lipoico y no a una clase discreta como las nitrosaminas. Con CAS 916746-61-7, fórmula molecular C12H23NO4S2 y peso molecular 309.4 g/mol, corresponde a un derivado modificado del ácido tióctico con funcionalidad adicional de nitrógeno y oxígeno. Su formación puede vincularse con intermedios de síntesis, reacciones secundarias durante la ciclación o transformación oxidativa de la química del ditiolano. La asignación estructural y la cuantificación a nivel traza suelen requerir LC-MS/MS, HRMS y métodos ortogonales LC-UV; la confirmación puede apoyarse en RMN y perfiles de impurezas para documentación regulatoria.
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