(Z)-Methyl 4-Bromo-2-(methoxyimino)-3-oxo-butanoic Acid Ester-d3 is an intermediate used in the synthesis of Desfuroyl Ceftiofur Cysteine Disulfide-d3 (D289907), which is a labeled Desfuroyl Ceftiofur-related metabolite that have the potential to be microbiologic active in swine muscle, kidney, liver and fat.