3PJQ:
reference: Crystal structure of an enzymatically inactive trans-sialidase-like lectin from Trypanosoma cruzi: The carbohydrate binding mechanism involves residual sialidase activity., Oppezzo P, Obal G, Baraibar MA, Pritsch O, Alzari PM, Buschiazzo A, Biochim Biophys Acta. 2011 Apr 30. PMID: 21570497

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