Used in the synthesis of oligonucleotides, particularly in solid-phase DNA synthesis. It serves as a building block for introducing cytosine into DNA sequences. The benzoyl (bz) protecting group ensures selective reactivity during the coupling process, enhancing the efficiency of the synthesis. Commonly applied in genetic research, diagnostics, and therapeutic development, such as in the creation of antisense oligonucleotides or primers for PCR. Its role is critical in producing high-purity, sequence-specific DNA strands for various molecular biology applications.