3,4-Bis(difluoromethoxy)benzaldehyde is an impurity of the antiasthmatic drug Roflumilast. 3,4-Bis(difluoromethoxy)benzaldehyde is used in the preparation of diphenylethylene compounds as PDE4 (phosphodiesterase-4) inhibitors for treatment of cancer, CNS disorders, and inflammatory disorders.Form:Yellow OilSolubility:Chloroform, Methanol