((R)-1-((2S,3R)-3-Hydroxy-2-(6-phenylpicolinamido)butanamido)-3-methylbutyl)boronic acid is a complex, stereochemically defined boronic acid derivative. Its structure incorporates a boronic acid warhead, a peptide-like backbone, and a 6-phenylpicolinamide moiety. This specific combination of functional groups is characteristic of molecules designed for targeted protein degradation. This compound is a key intermediate in the synthesis of proteolysis-targeting chimeras (PROTACs). The boronic acid group serves as a ligand for binding to specific target proteins, such as those involved in oncology or inflammatory pathways. The peptide-like scaffold and the picolinamide unit are integral parts of the linker that connects the target-binding moiety to an E3 ubiquitin ligase-recruiting ligand, enabling the formation of the ternary complex necessary for induced protein degradation. As a PROTAC intermediate, it is a crucial tool in medicinal chemistry research for developing novel therapeutic agents against diseases traditionally considered "undruggable." Its synthesis and application are primarily within the realm of preclinical drug discovery for cancer and other conditions driven by specific protein targets.