1RCA:
reference: Structure of the crystalline complex of deoxycytidylyl-3',5'-guanosine (3',5'-dCpdG) cocrystallized with ribonuclease at 1.9 A resolution., Listgarten JN, Maes D, Wyns L, Aguilar CF, Palmer RA, Acta Crystallogr D Biol Crystallogr. 1995 Sep 1;51(Pt 5):767-71. PMID: 15299807

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