3MNN:
reference: A ruthenium antimetastasis agent forms specific histone protein adducts in the nucleosome core., Wu B, Ong MS, Groessl M, Adhireksan Z, Hartinger CG, Dyson PJ, Davey CA, Chemistry. 2011 Mar 21;17(13):3562-6. doi: 10.1002/chem.201100298. Epub, 2011 Feb 23. PMID: 21344528

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