Biuret is a chemical compound with the chemical formula C₂H₅N₃O₂. It is also known as carbamylurea. It is the result of condensation of two molecules of  urea and is a problematic impurity in urea-based fertilizers. This white solid is soluble in hot water. Biuret was first prepared and studied by Gustav Heinrich Wiedemann (1826 - 1899) for his doctoral dissertation, which was submitted in 1847. His findings were reported in several articles.