4INH:
reference: Structural Basis of Substrate Specificity and Protease Inhibition in Norwalk Virus., Muhaxhiri Z, Deng L, Shanker S, Sankaran B, Estes MK, Palzkill T, Song Y, Prasad BV, J Virol. 2013 Jan 30. PMID: 23365454

This OCA Structure page
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