Receptor antagonists are molecules that bind to receptors in the body and inhibit their activation by blocking the binding of endogenous ligands or other agonists. These antagonists can be used to study the function of specific receptors, investigate the role of receptors in disease states, or serve as potential therapeutic agents. Receptor antagonists are commonly used in pharmacology and drug development to block the effects of certain receptors and pathways in the body. This research area involves the design, synthesis, and testing of compounds that can selectively block specific receptors to modulate biological processes. Additionally, receptor antagonists play a critical role in understanding the underlying mechanisms of diseases and identifying potential targets for drug development.