4RTE:
reference: Platinated oligomers of bovine pancreatic ribonuclease: Structure and stability., Picone D, Donnarumma F, Ferraro G, Russo Krauss I, Fagagnini A, Gotte G, Merlino A, J Inorg Biochem. 2015 May;146:37-43. doi: 10.1016/j.jinorgbio.2015.02.011. Epub, 2015 Feb 26. PMID: 25756333

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