– 4-MDM (4-Methoxydiphenylmethane) is an orally active anti-inflammatory compound that selectively enhances the aminopeptidase activity of leukotriene A4 hydrolase (LTA4H). By promoting the degradation of proline-glycine-proline by LTA4H, 4-MDM reduces neutrophil recruitment in the lungs, alleviating inflammation without affecting the epoxide hydrolase activity of LTA4H. This compound is useful for research in pulmonary diseases.