2NNZ:
reference: Hypothetical protein AF2241 from Archaeoglobus fulgidus adopts a cyclophilin-like fold., Ai X, Li L, Semesi A, Yee A, Arrowsmith CH, Li SS, Choy WY, J Biomol NMR. 2007 Aug;38(4):353-8. Epub 2007 Jul 4. PMID: 17610131

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