6VCJ:
reference: The Structural Basis for Nonsteroidal Anti-Inflammatory Drug Inhibition of Human Dihydrofolate Reductase., Duff MR Jr, Gabel SA, Pedersen LC, DeRose EF, Krahn JM, Howell EE, London RE, J Med Chem. 2020 Aug 13;63(15):8314-8324. doi: 10.1021/acs.jmedchem.0c00546. Epub, 2020 Jul 28. PMID: 32658475

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