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To the Editor, By the end of December 2019, an increasing number of patients diagnosed with pneumonia and respiratory failure of unknown origin in the Chinese city of Wuhan, lead to the discovery of the 2019 novel Coronavirus. Up to date, the therapy of the SARS-CoV-2 is limited to treat the symptoms and not to cure the Covid-19 disease (like Tamiflu for influenza), for this reason, the discovery of new antivirals is crucial.Natural products are an important source of antiviral compounds and therefore are extensively studied (Kim, 2021).Broad studies in our laboratory on Asian, African and Brazilian Strychnos species have been conducted, and have led to the isolation of numerous alkaloidic compounds. These plants have been evaluatedfor their antimalarial and cytotoxic potentials (Beaufay et al., 2018;

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