5CTM:
reference: Class D beta-lactamases do exist in Gram-positive bacteria., Toth M, Antunes NT, Stewart NK, Frase H, Bhattacharya M, Smith CA, Vakulenko SB, Nat Chem Biol. 2015 Nov 9. doi: 10.1038/nchembio.1950. PMID: 26551395

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