1LOL:
reference: Crystal structures of inhibitor complexes reveal an alternate binding mode in orotidine-5'-monophosphate decarboxylase., Wu N, Pai EF, J Biol Chem 2002 Aug 2;277(31):28080-7. PMID: 12011084

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