2HM7:
reference: Functional and structural features of the oxyanion hole in a thermophilic esterase from Alicyclobacillus acidocaldarius., Mandrich L, Menchise V, Alterio V, De Simone G, Pedone C, Rossi M, Manco G, Proteins. 2007 Dec 12;. PMID: 18076040

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