3DS7:
reference: A structural basis for the recognition of 2'-deoxyguanosine by the purine riboswitch., Edwards AL, Batey RT, J Mol Biol. 2009 Jan 23;385(3):938-48. Epub 2008 Nov 5. PMID: 19007790

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