1LL9:
reference: Using steric hindrance to design new inhibitors of class C beta-lactamases., Trehan I, Morandi F, Blaszczak LC, Shoichet BK, Chem Biol 2002 Sep;9(9):971-80. PMID: 12323371

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