The molecule is a single-stranded DNA oligonucleotide comprised of one thymidine, one deoxyguanidine and two deoxycytidine residues connected by 3'->5' phosphodiester linkages in the sequence CTGC.
[(2R,3S,5R)-5-(2-amino-6-oxo-1H-purin-9-yl)-2-[[[(2R,3S,5R)-2-[[[(2R,3S,5R)-5-(4-amino-2-oxopyrimidin-1-yl)-2-(hydroxymethyl)oxolan-3-yl]oxy-hydroxyphosphoryl]oxymethyl]-5-(5-methyl-2,4-dioxopyrimidin-1-yl)oxolan-3-yl]oxy-hydroxyphosphoryl]oxymethyl]oxolan-3-yl] [(2R,3S,5R)-5-(4-amino-2-oxopyrimidin-1-yl)-3-hydroxyoxolan-2-yl]methyl hydrogen phosphate