Pyraziners are a class of heterocyclic aromatic organic compounds that contain a pyrazine ring, which is a six-membered ring with two nitrogen atoms and four carbon atoms. Pyrazines are known for their distinctive nutty or savory odor and are found in various foods such as roasted coffee, cocoa, and certain fruits. In a medical context, pyrazines may be used as a component of pharmaceuticals or drugs due to their biological activity, but they do not have a specific medical definition on their own.