Diethyl Butylethylmalonate-d5 is the isotope labelled analog of Diethyl Butylethylmalonate, a derivative of Diethyl 2-n-Butylmalonate (D443880) which is a reagent in the synthesis of 2,5-dihydropyrrole formyl hydroxyamino derivatives as peptide deformylase inhibitors against drug-resistant bacteria.