| 2BOK: reference: Quantification of cation-pi interactions in protein-ligand complexes: crystal-structure analysis of Factor Xa bound to a quaternary ammonium ion ligand., Scharer K, Morgenthaler M, Paulini R, Obst-Sander U, Banner DW, Schlatter D, Benz J, Stihle M, Diederich F, Angew Chem Int Ed Engl. 2005 Jul 11;44(28):4400-4. PMID: 15952226 |
This OCA 
Structure page
uses Jmol,
developed by the Jmol Development Team
(documentation).