2ATC:
reference: Crystal and molecular structures of native and CTP-liganded aspartate carbamoyltransferase from Escherichia coli., Honzatko RB, Crawford JL, Monaco HL, Ladner JE, Ewards BF, Evans DR, Warren SG, Wiley DC, Ladner RC, Lipscomb WN, J Mol Biol 1982 Sep 15;160(2):219-63. PMID: 6757446

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