5D6S:
reference: Epoxyqueuosine Reductase Structure suggests a Mechanism for Cobalamin-dependent tRNA Modification., Payne KA, Fisher K, Sjuts H, Dunstan MS, Bellina B, Johannissen L, Barran P, Hay S, Rigby SE, Leys D, J Biol Chem. 2015 Sep 16. pii: jbc.M115.685693. PMID: 26378237

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