Used in pharmaceutical synthesis as a protected spirocyclic diamine building block. Its rigid spiro structure and masked amine functionalities make it valuable for designing bioactive molecules, particularly in drug discovery for central nervous system targets and kinase inhibitors. The Boc group allows for selective deprotection and further derivatization, enabling efficient construction of complex heterocyclic compounds. Commonly employed in medicinal chemistry for peptidomimetics and as an intermediate in the preparation of potent small-molecule therapeutics.