1M2X:
reference: The 1.5 A structure of chryseobacterium meningosepticum Zn-beta -lactamase in complex with the inhibitor, D-captopril., Garcia-Saez I, Hopkins J, Papamicael C, Franceschini N, Amicosante G, Rossolini GM, Galleni M, Frere JM, Dideberg O, J Biol Chem 2003 Apr 8;. PMID: 12684522

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