6V2J:
reference: A CLC-ec1 mutant reveals global conformational change and suggests a unifying mechanism for the Cl(-)/H(+) transport cycle., Chavan TS, Cheng RC, Jiang T, Mathews II, Stein RA, Koehl A, Mchaourab HS, Tajkhorshid E, Maduke M, Elife. 2020 Apr 20;9. pii: 53479. doi: 10.7554/eLife.53479. PMID: 32310757

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