3MPU:
reference: The pathway of product release from the R state of aspartate transcarbamoylase., Mendes KR, Kantrowitz ER, J Mol Biol. 2010 Sep 3;401(5):940-8. Epub 2010 Jul 8. PMID: 20620149

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