| 3HBB: reference: Structures of dihydrofolate reductase-thymidylate synthase of Trypanosoma cruzi in the folate-free state and in complex with two antifolate drugs, trimetrexate and methotrexate., Senkovich O, Schormann N, Chattopadhyay D, Acta Crystallogr D Biol Crystallogr. 2009 Jul;65(Pt 7):704-16. Epub 2009, Jun 20. PMID: 19564691 |
This OCA 
Structure page
uses Jmol,
developed by the Jmol Development Team
(documentation).