According to previous reports, coumarins exhibited anti-inflammatory, antibacterial, antiviral, antioxidant, antithrombotic, anti-Alzheimer’s disease (AD), antidiabetic, anticonvulsant, and antitumor effects, as well as the inhibition of lipoxygenase and the inhibition of xanthine oxidase [2]. The gene discussed is XDH; the disease is Alzheimer disease.