4CQB:
reference: X-Ray Structure and Mutagenesis Studies of the N-Isopropylammelide Isopropylaminohydrolase, AtzC., Balotra S, Warden AC, Newman J, Briggs LJ, Scott C, Peat TS, PLoS One. 2015 Sep 21;10(9):e0137700. doi: 10.1371/journal.pone.0137700., eCollection 2015. PMID: 26390431

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