1LDZ:
reference: NMR solution structure of the lead-dependent ribozyme: evidence for dynamics in RNA catalysis., Hoogstraten CG, Legault P, Pardi A, J Mol Biol 1998 Nov 27;284(2):337-50. PMID: 9813122

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