2LPS:
reference: Molecular dynamics re-refinement of two different small RNA loop structures using the original NMR data suggest a common structure., Henriksen NM, Davis DR, Cheatham Iii TE, J Biomol NMR. 2012 Aug;53(4):321-39. Epub 2012 Jun 20. PMID: 22714631

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