2Y91:
reference: Novel fragments of clavulanate observed in the structure of the class A beta-lactamase from Bacillus licheniformis BS3., Power P, Mercuri P, Herman R, Kerff F, Gutkind G, Dive G, Galleni M, Charlier P, Sauvage E, J Antimicrob Chemother. 2012 Oct;67(10):2379-87. Epub 2012 Jul 6. PMID: 22773738

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