6V75:
reference: Biochemical and structural insights into how amino acids regulate pyruvate kinase muscle isoform 2., Nandi S, Dey M, J Biol Chem. 2020 Apr 17;295(16):5390-5403. doi: 10.1074/jbc.RA120.013030. Epub, 2020 Mar 6. PMID: 32144209

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