FOY 251, a metabolite of camostat, is primarily recognized for its role in medical research and therapeutic applications. It is extensively studied for its ability to inhibit serine proteases, which are enzymes involved in various physiological processes. This inhibition makes it valuable in the treatment of conditions like pancreatitis, where it helps reduce inflammation by blocking the activation of proteolytic enzymes. Additionally, FOY 251 is investigated for its potential antiviral properties, particularly in inhibiting the entry of certain viruses into host cells, offering a promising avenue for antiviral drug development. Its applications also extend to cancer research, where it is explored for its ability to modulate tumor growth and metastasis by targeting protease activity. Overall, FOY 251 serves as a critical compound in advancing treatments for inflammatory, viral, and oncological diseases.