This is the nucleotide dCMP, or deoxy-cytidine-5'-monophosphate. The phosphorus atom in the phosphate group is purple or pink, the sugar is a 5-membered ring with a red or orange oxygen atom in the ring, and the base, cytosine, is a heterocyclic molecule, whose nitrogen atoms are blue.
There are four such nucleotides in DNA. The others are dAMP, dGMP, and dTMP.
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