4GD8:
reference: Structures of SHV-1 beta-lactamase with penem and penam sulfone inhibitors that form cyclic intermediates stabilized by carbonyl conjugation., Ke W, Pattanaik P, Bethel CR, Sheri A, Buynak JD, Bonomo RA, van den Akker F, PLoS One. 2012;7(11):e49035. doi: 10.1371/journal.pone.0049035. Epub 2012 Nov 8. PMID: 23145056

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