6IWW:
reference: Structural insights into sodium transport by the oxaloacetate decarboxylase sodium pump., Xu X, Shi H, Gong X, Chen P, Gao Y, Zhang X, Xiang S, Elife. 2020 May 27;9. pii: 53853. doi: 10.7554/eLife.53853. PMID: 32459174

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