| 4JPM: reference: beta-Lactamase Inhibition by 7-Alkylidenecephalosporin Sulfones: Allylic Transposition and Formation of an Unprecedented Stabilized Acyl-Enzyme., Rodkey EA, McLeod DC, Bethel CR, Smith KM, Xu Y, Chai W, Che T, Carey PR, Bonomo RA, van den Akker F, Buynak JD, J Am Chem Soc. 2013 Nov 12. PMID: 24219313 |
This OCA 
Structure page
uses Jmol,
developed by the Jmol Development Team
(documentation).