Used in solid-phase oligonucleotide synthesis as a phosphoramidite building block for introducing modified nucleosides into DNA strands. Its structure enables selective protection and coupling efficiency, making it valuable in the production of antisense oligonucleotides, siRNA, and diagnostic probes. The dimethylamino methylene group enhances stability during synthesis, while the cyanoethyl and diisopropyl groups facilitate deprotection and reduce side reactions. Commonly applied in automated DNA synthesizers for research and therapeutic development.