2DCF:
reference: Nylon-oligomer degrading enzyme/substrate complex: catalytic mechanism of 6-aminohexanoate-dimer hydrolase., Negoro S, Ohki T, Shibata N, Sasa K, Hayashi H, Nakano H, Yasuhira K, Kato D, Takeo M, Higuchi Y, J Mol Biol. 2007 Jun 29;370(1):142-56. Epub 2007 Apr 24. PMID: 17512009

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