4OR7:
reference: Crystal Structures of Klebsiella pneumoniae Dihydrofolate Reductase Bound to Propargyl-Linked Antifolates Reveal Features for Potency and Selectivity., Lamb KM, Lombardo MN, Alverson J, Priestley ND, Wright DL, Anderson AC, Antimicrob Agents Chemother. 2014 Dec;58(12):7484-91. doi: 10.1128/AAC.03555-14. , Epub 2014 Oct 6. PMID: 25288083

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