The phosphoric acid in nucleotides has several forms such as one, two and three molecules. In addition, the inside of the nucleotide molecule can be dehydrated and condensed into cyclic nucleotides. Pentose and organics synthesize nucleosides, nucleosides and phosphoric acid synthesize nucleotides, and 8 kinds of nucleotides form nucleic acids. Nucleotides are mainly involved in the formation of nucleic acids, and many single nucleotides also have a variety of important biological functions, such as adenosine triphosphate and dehydrocoenzyme related to energy bolism. Five-carbon sugar and organics synthesize nucleosides, nucleosides and phosphoric acids synthesize nucleotides, and four kinds of nucleotides constitute nucleic acids. Nucleotides are mainly involved in the formation of nucleic acids, and many single nucleotides also have a variety of important biological functions, such as adenosine triphosphate and dehydrocoenzyme related to energy bolism. Analogues of certain nucleotides interfere with nucleotide bolism and can be used as anticancer drugs.