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2,9-diazaspiro[5.5]undecane-9-carboxylic acid tert-butyl ester; CAS No.: 1023595-19-8; ChemShuttle s 2,9-diazaspiro[5.5]undecane derivative enables construction of multivalent protein degraders. As chemical synthesis company, we optimize transition metal-free cyclization methods for sensitive bis-amide formations. Researchers utilize these chemical building blocks through our CRO chemical synthesis partnerships to explore targeted protein degradation pathways.