4XBC:
reference: Structure-Guided Design and Optimization of Dipeptidyl Inhibitors of Norovirus 3CL Protease. Structure-Activity Relationships and Biochemical, X-ray Crystallographic, Cell-Based, and In Vivo Studies., Galasiti Kankanamalage AC, Kim Y, Weerawarna PM, Uy RA, Damalanka VC, Mandadapu SR, Alliston KR, Mehzabeen N, Battaile KP, Lovell S, Chang KO, Groutas WC, J Med Chem. 2015 Mar 19. PMID: 25761614

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