Barbituric acid is a compound that was originally derived from urea. It belongs to the class of chemicals known as barbiturates and is used medically as a sedative and hypnotic. However, there are various synonyms for this chemical compound. These synonyms include 2,4,6-trioxohexahydropyrimidine, malonylurea, malonylureas, 6-hydroxypyrimidine-2,4(1H,3H)-dione and 6-oxohexahydropyrimidine-2,4-dione. These synonyms are useful for researchers who want to find information about barbituric acid using different scientific databases. Regardless of the synonym being used, it is important to understand that barbituric acid has a wide range of biological and medical applications.