2F1O:
reference: The crystal structure of NAD(P)H quinone oxidoreductase 1 in complex with its potent inhibitor dicoumarol., Asher G, Dym O, Tsvetkov P, Adler J, Shaul Y, Biochemistry. 2006 May 23;45(20):6372-8. PMID: 16700548

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