N-(3-Dibenzofuranyl)-(3,4-dideutero)-5-nitro-2-furancarboxamide is deuterium labelled form of N-(3-Dibenzofuranyl)-5-nitro-2-furancarboxamide (D417535), which is synthesized from Dibenzo[b,d]furan-3-amine (D418205) that is a building block used as a reactant in the preparation of dibenzofuryl(phosphonomethyl)alanines as endothelin converting enzyme inhibitors.