5L7V:
reference: Structural and mechanistic insights into a Bacteroides vulgatus retaining N-acetyl-beta-galactosaminidase that uses neighbouring group participation., Roth C, Petricevic M, John A, Goddard-Borger ED, Davies GJ, Williams SJ, Chem Commun (Camb). 2016 Sep 25;52(74):11096-9. doi: 10.1039/c6cc04649e. Epub, 2016 Aug 22. PMID: 27546776

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