3K5H:
reference: Structural and functional studies of Aspergillus clavatus N(5)-carboxyaminoimidazole ribonucleotide synthetase ., Thoden JB, Holden HM, Paritala H, Firestine SM, Biochemistry. 2010 Feb 2;49(4):752-60. PMID: 20050602

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