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1,7-diazaspiro[4.4]nonane-7-carboxylic acid tert-butyl ester; CAS No.: 646055-63-2; As part of our cycle compounds portfolio, this 1,7-diazaspiro[4.4]nonane derivative offers expanded ring strain modulation for proteolysis-targeting chimera (PROTAC) linkers. ChemShuttle, a custom chemical synthesis company, engineers these bridged heterocycles with precise stereochemical control using flow hydrogenation technologies. Clients leverage our building blocks for drug discovery to create conformationally restricted peptides and allosteric enzyme modulators with enhanced bioavailability.