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2-oxo-3-oxa-1,9-diazaspiro[5.5]undecane; CAS No.: 1389264-24-7; ChemShuttle s oxa-diazaspiro undecanone serves as conformationally restricted urea isostere. Our chemical synthesis company develops safe phosgene alternatives for carbamate formations. These building blocks enable exploration of proteasome inhibitors with enhanced metabolic stability.