Organic chemistry, also known as carbon compound chemistry, studying of the composition, structure, properties, preparation methods and applications of organic compounds, is a very important branch of chemistry. Carbon substances are called organic compounds, because the former chemists believed that carbon substances must be made by organisms; however, in 1828, German chemist Friedrich Weiler was successfully synthesized urea (a kind of biomolecule)in the laboratory for the first time. Henceforth, organic chemistry has deviated from the scope defined by the tradition and expanded into the carbonaceous chemistry.