5'-d[GCGAGTGAT(6-4)TATGGACGG]-3'
5'-d[gcgagtgat(6-4)tatggacgg]-3'
A single-strand DNA oligonucleotide comprised of four deoxyadenosine, two deoxycytidine, four thymidine and eight deoxyguanidine residues connected by 3'→5' phosphodiester linkages in the sequence G-C-G-A-G-T-G-A-T-T-A-T-G-G-A-C-G-G, with a (6-4) lesion at the central two thymidine residues (PDB entry: <a href="https://www.ebi.ac.uk/pdbe/entry/pdb/3VW3" target="_blank">3VW3</a>).