This document provides an overview of purine nucleotides, pyrimidine nucleotides, ribonucleotides, and deoxyribonucleotides. It also describes the nomenclature used for nucleosides and nucleotides. Nucleosides are named using the suffix -osine for purine bases and -idine for pyrimidine bases. Nucleotides are named by specifying the number of phosphate groups added to the nucleoside. Deoxyribonucleotides are differentiated from ribonucleotides by using the prefix "deoxy" or "d". The document lists three reference books on biochemistry and related topics.