CARM1 inhibitor 1 hydrochloride is primarily used in biochemical research to study the role of CARM1 (coactivator-associated arginine methyltransferase 1) in various cellular processes. It is applied to inhibit the methylation activity of CARM1, which helps in understanding its function in gene regulation, chromatin remodeling, and signal transduction pathways. This compound is valuable in cancer research, as CARM1 is often overexpressed in certain cancers, and its inhibition can provide insights into potential therapeutic strategies. Additionally, it is used in studies related to stem cell differentiation and immune response modulation, where CARM1 plays a significant role. Researchers also utilize this inhibitor to explore its effects on protein-protein interactions and the epigenetic landscape, contributing to the development of targeted therapies for various diseases.