2PKS:
reference: Design, synthesis and biological evaluation of thrombin inhibitors based on a pyridine scaffold., Blomberg D, Fex T, Xue Y, Brickmann K, Kihlberg J, Org Biomol Chem. 2007 Aug 21;5(16):2599-605. PMID: 18019535

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