2CKY:
reference: Structure of the eukaryotic thiamine pyrophosphate riboswitch with its regulatory ligand., Thore S, Leibundgut M, Ban N, Science. 2006 May 26;312(5777):1208-11. Epub 2006 May 4. PMID: 16675665

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