6ENG:
reference: Structural Basis for DNA Gyrase Interaction with Coumermycin A1., Vanden Broeck A, McEwen AG, Chebaro Y, Potier N, Lamour V, J Med Chem. 2019 Apr 3. doi: 10.1021/acs.jmedchem.8b01928. PMID: 30920824

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