Used in bioconjugation processes to introduce trifluoroacetyl-protected amine groups into molecules, enabling selective modification of peptides, proteins, and other biomolecules. Its N-hydroxysuccinimide ester group reacts efficiently with primary amines under mild conditions, making it valuable in the synthesis of labeled proteins, antibody-drug conjugates, and diagnostic probes. The trifluoroacetyl group can be easily deprotected to reveal a free amine for further functionalization, allowing stepwise assembly of complex molecular architectures. Commonly applied in pharmaceutical research and development of targeted therapeutics.