4NC5:
reference: Tuning mechanism-based inactivators of neuraminidases: mechanistic and structural insights., Buchini S, Gallat FX, Greig IR, Kim JH, Wakatsuki S, Chavas LM, Withers SG, Angew Chem Int Ed Engl. 2014 Mar 24;53(13):3382-6. doi: 10.1002/anie.201309675., Epub 2014 Mar 3. PMID: 24591206

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