5ET2:
reference: Inosine Can Increase DNA's Susceptibility to Photo-oxidation by a RuII Complex due to Structural Change in the Minor Groove., Keane PM, Hall JP, Poynton FE, Poulsen BC, Gurung SP, Clark IP, Sazanovich IV, Towrie M, Gunnlaugsson T, Quinn SJ, Cardin CJ, Kelly JM, Chemistry. 2017 Aug 1;23(43):10344-10351. doi: 10.1002/chem.201701447. Epub 2017 , Jul 12. PMID: 28543779

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