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Isojacareubin can be isolated from Hypericum japonicum. Isojacareubin covalently inhibits SARS-CoV-2 3CLpro. Isojacareubin also has anti-helicobacter activity. Isojacareubin inhibits PKC, and suppresses hepatocellular carcinoma metastasis and induces apoptosis[1][2][3].

[1] Kyoko Ishiguro, et al. An isopentenylated flavonol from Hypericum japonicum. Phytochemistry. 1993. 32 (6), 1583-1585.
[2] Khan A, et al. Discovery of Isojacareubin as a covalent inhibitor of SARS-CoV-2 main protease using structural and experimental approaches. J Med Virol. 2023 Feb;95(2):e28542. DOI:10.1002/jmv.28542
[3] Yuan X, et al. Inhibition of protein kinase C by isojacareubin suppresses hepatocellular carcinoma metastasis and induces apoptosis in vitro and in vivo. Sci Rep. 2015 Aug 6;5:12889. DOI:10.1038/srep12889