6E9O:
reference: Structures suggest a mechanism for energy coupling by a family of organic anion transporters., Leano JB, Batarni S, Eriksen J, Juge N, Pak JE, Kimura-Someya T, Robles-Colmenares Y, Moriyama Y, Stroud RM, Edwards RH, PLoS Biol. 2019 May 13;17(5):e3000260. doi: 10.1371/journal.pbio.3000260. PMID: 31083648

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