Ribonucleotide Reductase (RR) is the unique enzyme responsible for the conversion of ribonucleotides to2'-deoxyribonucleotides in human. Study have shown that small subunit R2can promote the transformation of various oncogenes and enhance the invasion ability of cancer cells. Therefore, the study of R2inhibitor, to inhibit the generation and transfer oftumor cells, has become one of the target for research to cure human cancer, and got more and more attention.In this article, we mainly focus the small submi...