3QLY:
reference: Crystal structures of Candida albicans dihydrofolate reductase bound to propargyl-linked antifolates reveal the flexibility of active site loop residues critical for ligand potency and selectivity., Paulsen JL, Bendel SD, Anderson AC, Chem Biol Drug Des. 2011 Jul 5. doi: 10.1111/j.1747-0285.2011.01169.x. PMID: 21726415

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