2KGK:
reference: The solution structure of Bacillus anthracis dihydrofolate reductase yields insight into the analysis of structure-activity relationships for novel inhibitors., Beierlein JM, Deshmukh L, Frey KM, Vinogradova O, Anderson AC, Biochemistry. 2009 May 19;48(19):4100-8. PMID: 19323450

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