2R2U:
reference: Crystal structure of DNA-bound Co(III) bleomycin B2: Insights on intercalation and minor groove binding., Goodwin KD, Lewis MA, Long EC, Georgiadis MM, Proc Natl Acad Sci U S A. 2008 Apr 1;105(13):5052-6. Epub 2008 Mar 24. PMID: 18362349

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