6B9B:
reference: KatG-Mediated Oxidation Leading to Reduced Susceptibility of Bacteria to Kanamycin., Loewen PC, De Silva PM, Donald LJ, Switala J, Villanueva J, Fita I, Kumar A, ACS Omega. 2018 Apr 30;3(4):4213-4219. doi: 10.1021/acsomega.8b00356. Epub 2018, Apr 16. PMID: 29732452

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