| 1NFY: reference: Molecular structures of human factor Xa complexed with ketopiperazine inhibitors: preference for a neutral group in the S1 pocket., Maignan S, Guilloteau JP, Choi-Sledeski YM, Becker MR, Ewing WR, Pauls HW, Spada AP, Mikol V, J Med Chem 2003 Feb 27;46(5):685-90. PMID: 12593649 |
This OCA 
Structure page
uses Jmol,
developed by the Jmol Development Team
(documentation).