4MQ5:
reference: Perturbation of the monomer-monomer interfaces of the benzoylformate decarboxylase tetramer., Andrews FH, Rogers MP, Paul LN, McLeish MJ, Biochemistry. 2014 Jul 15;53(27):4358-67. doi: 10.1021/bi500081r. Epub 2014 Jul, 3. PMID: 24956165

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