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3C-like proteinase is a family of enzymes found in the Coronavirus polyprotein. It cleaves the polyprotein at two self-cleavage sites. It is a cysteine protease under clan PA, MEROPS classification C30. In coronaviruses, it is nonstructural protein number 5 (nsp5).

3CLpro

Cat. No. Product Name CAS No. Information
CSN12229 Zanamivir   139110-80-8 Zanamivir is the first of two registered neuraminidase inhibitors for the treatment and prophylaxis of influenza. Zanamivir could inhibit SARS-CoV-2 3CLpro main protease.
CSN25593 Theaflavin-3,3'-digallate 30462-35-2 Theaflavin-3,3'-digallate is a tea extract. Theaflavin-3,3'-digallate inhibited 3CLpro with IC50 value of 9.5μM in a fluorogenic substrate peptide assay.
CSN12034 Tanshinone IIB 17397-93-2 Tanshinone IIB (TSB), a natural product isolated and purified from the roots of Salvia miltiorrhiza, can significantly inhibit the DNA laddering, cytotoxicity and apoptosis of rat cortical neurons induced by staurosporine in a concentration-dependent manner. Tanshinone IIB showed inhibitory effect on PL(pro) with IC50 value of 10.7μM and less inhibitory effect on 3CLpro with IC50 value of 24.8μM.
CSN13608 Tanshinone IIA Sulfonate Sodium   69659-80-9 Tanshinone IIA sulfonate sodium is a water-soluble derivative of tanshinone IIA, which acts as an inhibitor of store-operated Ca2+entry (SOCE), and is used to treat cardiovascular disorders.
CSN19410 Tanshinone IIA   568-72-9 Tanshinone IIA is a naturally occuring cardioprotective agent which can inhibit NF-κB and AP-1 DNA binding and display antioxidant and anti-inflammatory properties. Tanshinone IIA showed inhibitory effect on PL(pro) with IC50 value of 1.6μM and less inhibitory effect on 3CLpro with IC50 value of 89.1μM.
CSN12435 Tanshinone I 568-73-0 Tanshinone I, an active principle isolated from the roots of Salvia miltiorrhiza (Danshen), is an inhibitor of type IIA human recombinant sPLA2 and rabbit recombinant cPLA2 with IC50s of 11 μM and 82 μM, respectively, is structurally similar to tanshinone IIA and may possess similar cytotoxic effects on tumor cells. Tanshinone I showed inhibitory effect on PL(pro) with IC50 value of 8.8μM and less inhibitory effect on 3CLpro with IC50 value of 38.7μM.
CSN11896 Saquinavir 127779-20-8 Saquinavir is an HIV Protease inhibitor used in antiretroviral therapy. Saquinavir could inhibit SARS-CoV-2 3CLpro main protease.
CSN25605 Rupintrivir 223537-30-2 Rupintrivir is a novel human Rhinovirus 3C Protease inhibitor and exhibited antiviral activity against HRV clinical isolates and HEV a mean EC50 of 24 nM (range, 3 to 104 nM) and a mean EC50 of 41 nM (range, 7 to 137 nM), respectively, in H1-HeLa cell protection assays.
CSN25590 Methyl tanshinonate 18887-19-9 Methyl tanshinonate showed inhibitory effect on PL(pro) with IC50 value of 9.2μM and less inhibitory effect on 3CLpro with IC50 value of 21.1μM.
CSN11198 Indinavir 150378-17-9 Indinavir is a potent and specific HIV protease inhibitor that appears to have good oral bioavailability. Indinavir could inhibit SARS-CoV-2 3CLpro main protease.
CSN16383 Hesperetin   520-33-2 Hesperetin is a flavanone extracted from the peel of citrus that exhibits inhibition of PDE4 and UGT. Hesperetin has antioxidative and anti-inflammatory effects as well. Hesperetin dose-dependently inhibited cleavage activity of the 3CLpro with IC50 value of 8.3μM in the cell-based assay.
CSN19988 Herbacetin 527-95-7 Herbacetin, a natural product isolated and purified from the herbs of Equisetum hyemale L. It was found to efficiently block the enzymatic activity of SARS-CoV 3CLpro.
CSN25342 GC376 1416992-39-6 GC376 is a 3CLpro (3C-like protease) inhibitor that shows promise in treating cats with certain presentations of FIP and has opened the door to targeted antiviral drug therapy.
CSN10460 Disulfiram   97-77-8 Disulfiram is a specific inhibitor of aldehyde-dehydrogenase (ALDH1), used for the treatment of chronic alcoholism by producing an acute sensitivity to alcohol. Disulfiram acts as an allosteric inhibitor of MERS-CoV PLpro but as a competitive (or mixed) inhibitor of SARS-CoV PLpro.
CSN16500 Dihydrotanshinone I 87205-99-0 Dihydrotanshinone I, a natural product isolated and purified from the roots of Salvia miltiorrhiza Bge., exhibits dose-dependent inhibition towards HLM-catalyzed propofol glucuronidation. Dihydrotanshinone I showed inhibitory effect on PL(pro) with IC50 value of 4.9μM and less inhibitory effect on 3CLpro with IC50 value of 14.4μM.
CSN25607 Dieckol 88095-77-6 Dieckol exhibited SARS-CoV 3CL(pro) trans/cis-cleavage inhibitory effects with IC50 values of 2.7 and 68.1 μM, respectively. It formed extremely strong hydrogen bonds to the catalytic dyad (Cys145 and His41) of the SARS-CoV 3CL(pro).
CSN16361 Cryptotanshinone   35825-57-1 Cryptotanshinone is a potent STAT3 inhibitor (IC50 =4.6 μM) and inhibits STAT3 Tyr705 phosphorylation in DU145 prostate cancer cells. Cryptotanshinone showed inhibitory effect on PL(pro) with IC50 value of 0.8μM and slight inhibitory effect on 3CLpro with IC50 value of 226.7μM.
CSN10276 Amentoflavone   1617-53-4 Amentoflavone is an inhibitor of human UDP-glucuronosyltransferases with anti-inflammatory, antioxidative, and neuroprotective effects and it can be isolated from the seeds of Ginkgo biloba L. Amentoflavone inhibited SARS-CoV 3CL(pro) with IC50 value of 8.3μM.
CSN17350 Aloe-Emodine   481-72-1 Aloe-emodin, a natural product isolated and purified from the root of Rheum palmatum L. with a specific in vitro and in vivo anti-neuroectodermal tumor activity, reduces the toxicity and ROS induced by both monomeric and oligomeric Aβ species, appears to have some protective effect not only against hepatocyte death but also on the inflammatory response subsequent to lipid peroxidation and has a strong non-carcinogenic stimulant-laxative action when applied to the skin, although it may increase the carcinogenicity of some kind of radiation. Aloe-Emodine dose-dependently inhibited cleavage activity of the 3CLpro with IC50 value of 366μM in the cell-based assay.
CSN25604 3CLpro inhibitor 14 2993-05-7 3CLpro inhibitor 14 is a 3CLpro inhibitor with IC50 value of 13.9 ± 2.2μM (SARS‐CoV 3CLpro).
CSN25591 16-(R)-ML188 1417700-13-0 16-(R)-ML188 is a non-covalent SARS-CoV 3CLpro inhibitor with good enzyme and antiviral inhibitory activity.
CSN27868 16-(S)-ML188 1417700-12-9
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