1FZC:
reference: Crystal structure of fragment double-D from human fibrin with two different bound ligands., Everse SJ, Spraggon G, Veerapandian L, Riley M, Doolittle RF, Biochemistry 1998 Jun 16;37(24):8637-42. PMID: 9628725

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