Source:http://linkedlifedata.com/resource/umls/id/C0041917
CSP: 2,4-diketopyrimidine; one of the 5 major bases (with adenine, guanine, cytosine, and thymine) which are a component of nucleic acids.,NCI: A chemical compound that is used to make one of the building blocks of RNA. It is a type of pyrimidine.