This compound, 2-(Boc-amino)ethanethiol, is a protected form of cysteamine used as a building block in organic synthesis. The tert-butoxycarbonyl (Boc) group protects the primary amine, allowing selective reactivity at the free thiol group. It is widely employed in bioconjugation reactions, such as thiol-maleimide coupling to form stable thioether bonds, which is valuable for attaching peptides, proteins, or drugs to surfaces or carriers. In peptide synthesis, it serves as a linker to introduce an aminoethylthio moiety, mimicking cysteine side chains or enabling site-specific modifications. Additionally, it is utilized in the preparation of pharmaceutical intermediates and bioactive molecules where controlled deprotection of the amine is required. The Boc group can be easily removed under mild acidic conditions without affecting the thiol.