5CTH:
reference: Structure of a eukaryotic SWEET transporter in a homotrimeric complex., Tao Y, Cheung LS, Li S, Eom JS, Chen LQ, Xu Y, Perry K, Frommer WB, Feng L, Nature. 2015 Nov 12;527(7577):259-63. doi: 10.1038/nature15391. Epub 2015 Oct 19. PMID: 26479032

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