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1-Oxa-6-azaspiro[3.3]heptane oxalate(2:1) is a spirocyclic building block featuring a four-membered oxetane ring and a four-membered azetidine ring. It is primarily used in medicinal chemistry for the synthesis of bioactive substances, including kinase inhibitors (EGFR, LRRK2) for treating cancer and Parkinson's disease.