Used as a protecting group in organic synthesis, particularly for amines. The tert-butyl hydroxy(methyl)carbamate moiety helps mask reactive amine functionalities during multi-step reactions, allowing selective transformations elsewhere in the molecule. It is stable under a variety of reaction conditions but can be removed under mild acidic conditions, making it valuable in peptide synthesis and pharmaceutical development. Its hydroxyl group also allows for further functionalization or attachment to solid supports in combinatorial chemistry.