Cytidine (Standard) is the standard substance of Cytidine, and it is applicable for quantitative analysis, quality control, and related research in biochemical experiments. Cytidine (Cytosine-1-beta-D-ribofuranoside) is a pyrimidine nucleoside comprised of a cytosine bound to ribose via a beta-N1-glycosidic bond. Cytidine is a precursor for uridine. Both cytidine and uridine are utilized in RNA synthesis.