Hydantoin derivatives are a class of organic compounds that are derived from hydantoin, a five-membered ring structure containing nitrogen and carbon. These compounds are often used in pharmaceuticals and agriculture due to their diverse biological activities, including anticonvulsant and antimicrobial properties. Common examples of hydantoin derivatives include phenytoin, a medication used to control seizures, and imidazolidine, which has applications in various chemical syntheses. The unique structure of hydantoin derivatives allows for modifications that enhance their effectiveness and specificity in different applications.