4K5E:
reference: Chiral linkers to improve selectivity of double-headed neuronal nitric oxide synthase inhibitors., Jing Q, Li H, Chreifi G, Roman LJ, Martasek P, Poulos TL, Silverman RB, Bioorg Med Chem Lett. 2013 Oct 15;23(20):5674-9. doi: 10.1016/j.bmcl.2013.08.034., Epub 2013 Aug 14. PMID: 23993333

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