3HFX:
reference: Crystal structure of the carnitine transporter and insights into the antiport mechanism., Tang L, Bai L, Wang WH, Jiang T, Nat Struct Mol Biol. 2010 Apr;17(4):492-6. Epub 2010 Mar 28. PMID: 20357772

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