The construction of oligonucleotides containing a modified nucleoside at a predefined site has provided new insights into the mechanisms of DNA repair and mutagenesis. 1 Organic chemists have played a key role by synthesizing nucleosides damaged by UV and ionizing radiation, chemical carcinogens, and chemotherapeutic agents. 2 Further incorporation of these modified nucleosides into oligonucleotides has enabled the direct study of ...
![7-oxofuro[3,2-g]chromene-2-carboxylic acid结构式](https://image.chemsrc.com/caspic/482/73097-21-9.png)
