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ethyl 1-((tert-butoxycarbonyl)amino)-3-oxocyclobutane-1-carboxylate; CAS No.: 129287-91-8; Ethyl 1-Boc-amino-3-oxocyclobutane-1-carboxylate combines ketone and ester functionalities for divergent synthesis. The cyclobutane ring induces strain to enhance target engagement. ChemShuttle s library of compounds includes such sp3-rich intermediates to address flatland concerns in lead optimization phases.