Cytidine-5'-triphosphate-d14 disodium is the deuterium labeled Cytidine-5-triphosphate[1]. Cytidine 5'-triphosphate (Cytidine triphosphate,5-CTP) is a nucleoside triphosphate and serves as a building block for nucleotides and nucleic acids, lipid biosynthesis. Cytidine triphosphate synthase can catalyze the formation of cytidine 5'-triphosphate from uridine 5'-triphosphate (UTP). Cytidine 5'-triphosphate is an essential biomolecule in the de novo pyrimidine biosynthetic pathway in T. gondii[2].