4DM3:
reference: Missing fragments: detecting cooperative binding in fragment-based drug design., Nair PC, Malde AK, Drinkwater N, Mark AE, ACS Med Chem Lett. 2012 Feb 14;3(4):322-6. doi: 10.1021/ml300015u. eCollection, 2012 Apr 12. PMID: 24900472

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