The molecule is a single-stranded DNA polynucleotide consisting of a repeating sequence of one deoxyguanosine residue and two deoxycytosine residues, with all residues connected by 3'->5' phosphodiester linkages.
[(2R,3S,5R)-5-(6-amino-1,4-dihydropurin-9-yl)-2-[[[(2R,3S,5R)-5-(2-amino-6-oxo-1H-purin-9-yl)-2-(phosphonooxymethyl)oxolan-3-yl]oxy-hydroxyphosphoryl]oxymethyl]oxolan-3-yl] [(2R,3S,5R)-5-(6-aminopurin-9-yl)-3-hydroxyoxolan-2-yl]methyl hydrogen phosphate