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X77 is a potent non-covalent inhibitor of the main protease of SARS-CoV-2 (SARS-CoV-2 Mpro)[1]. X77 binds to SARS-CoV-2 Mpro with a Kd value of 0.057 μM[2].

X77 is considered as a reference standard in number of docking and x-ray studies. X77 is a high affinity non-covalent inhibitor of the SARS-CoV-2 main protease (SARS-CoV-2 Mpro). Its calculated dissociation constant (Kd) is 0.057 μM. X77 is an analog of ML188 a selective non-covalent SARS-CoV 3CLpro inhibitor (IC50 = 1.5 μM).

[1] Sohini Chakraborti, et al. Drug Repurposing Approach Targeted Against Main Protease of SARS-CoV-2 Exploiting ‘Neighbourhood Behaviour’ in 3D Protein Structural Space and 2D Chemical Space of Small Molecules.
[2] Alexander M Andrianov, et al. Computational discovery of small drug-like compounds as potential inhibitors of SARS-CoV-2 main protease. J Biomol Struct Dyn DOI:10.1080/07391102.2020.1792989