3OMJ:
reference: Structural basis for cyclic Py-Im polyamide allosteric inhibition of nuclear receptor binding., Chenoweth DM, Dervan PB, J Am Chem Soc. 2010 Oct 20;132(41):14521-9. PMID: 20812704

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