5OGA:
reference: Prevalent Sequences in the Human Genome Can Form Mini i-Motif Structures at Physiological pH., Mir B, Serrano I, Buitrago D, Orozco M, Escaja N, Gonzalez C, J Am Chem Soc. 2017 Oct 11;139(40):13985-13988. doi: 10.1021/jacs.7b07383. Epub, 2017 Sep 27. PMID: 28933543

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