4O5Y:
reference: O(6)-Carboxymethylguanine in DNA forms a sequence context-dependent wobble base-pair structure with thymine., Zhang F, Tsunoda M, Kikuchi Y, Wilkinson O, Millington CL, Margison GP, Williams DM, Takenaka A, Acta Crystallogr D Biol Crystallogr. 2014 Jun;70(Pt 6):1669-79. doi:, 10.1107/S1399004714006178. Epub 2014 May 30. PMID: 24914978

This OCA Structure page
uses Jmol, developed by the Jmol Development Team (documentation).