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3-oxo-cyclobutanecarboxylic acid tert-butyl ester; CAS No.: 145549-76-4; 3-oxo-cyclobutanecarboxylic acid tert-butyl ester (CAS 145549-76-4) underscores ChemShuttle s role in chemical building blocks for strained ring derivatives. This cyclobutanecarboxylate (CAS 145549-76-4) acts as a chemical building block in peptide backbone rigidification and polymer chemistry. As a custom synthesis company, ChemShuttle tailors CAS 145549-76-4 s synthesis for enantioselective applications. The tert-butyl ester group enhances this chemical building block s stability during storage and handling.