4KS3:
reference: Structural basis for a class of nanomolar influenza A neuraminidase inhibitors., Kerry PS, Mohan S, Russell RJ, Bance N, Niikura M, Pinto BM, Sci Rep. 2013 Oct 16;3:2871. doi: 10.1038/srep02871. PMID: 24129600

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