5YZE:
reference: Co(II)(Chromomycin)(2) Complex Induces a Conformational Change of CCG Repeats from i-Motif to Base-Extruded DNA Duplex., Chen YW, Satange R, Wu PC, Jhan CR, Chang CK, Chung KR, Waring MJ, Lin SW, Hsieh LC, Hou MH, Int J Mol Sci. 2018 Sep 17;19(9). pii: ijms19092796. doi: 10.3390/ijms19092796. PMID: 30227633

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