Remdesivir is classified as a prodrug—that is, it is not the active form of the molecule with the indicated mechanism of action. In vivo transformation of this prodrug results in the following bioactive molecule.
A nucleotide is the basic building block of nucleic acids. ... A nucleotide consists of a sugar molecule (either ribose in RNA or deoxyribose in DNA) attached to a phosphate group and a nitrogen-containing base. The bases used in DNA are adenine (A), cytosine (C), guanine (G), and thymine (T).