1JOL: The Crystal Structure Of The Binary Complex Between Folinic Acid (Leucovorin) And E. Coli Dihydrofolate Reductase
reference: Crystal structures of Escherichia coli dihydrofolate reductase complexed with 5-formyltetrahydrofolate (folinic acid) in two space groups: evidence for enolization of pteridine O4., Lee H, Reyes VM, Kraut J, Biochemistry 1996 Jun 4;35(22):7012-20. PMID: 8679526

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