2,6-Diazaspiro[3.3]heptane-2-carboxylic acid, 1,1-dimethylethyl ester, hemioxalate salt is a chemical compound featuring a unique spirocyclic structure containing two nitrogen atoms within a 7-membered ring system. It is a protected derivative of the 2,6-diazaspiro[3.3]heptane scaffold, with the carboxylic acid group protected as a tert-butyl ester and the salt formed with oxalic acid. This compound serves as a crucial and versatile building block in medicinal chemistry and drug discovery. The 2,6-diazaspiro[3.3]heptane moiety is a highly sought-after saturated heterocyclic scaffold used to improve the physicochemical and pharmacokinetic properties of drug candidates. It is frequently incorporated into molecules targeting a wide range of diseases, including central nervous system disorders, infectious diseases, and oncology, to modulate properties like solubility, metabolic stability, and conformational rigidity. As a protected amine-carboxylate synthon, it is a key intermediate for the synthesis of more complex molecules. Its primary application lies in the research and development of new pharmaceutical agents, making it a valuable intermediate for constructing peptidomimetics and other bioactive compounds.