5,6,7,8-Tetrahydro-1,8-naphthyridine-2-carbaldehyde hydrochloride is a derivative of 5,6,7,8-tetrahydro-1,8-naphthyridine-2-carbaldehyde combined with hydrochloric acid. This compound possesses unique chemical properties and reactivity, making it valuable for various synthetic applications, particularly in pharmaceutical and chemical research.