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" ... The antiviral action of NT-VRL was determined by treating uninfected lung cells with the substances researched in the study. In addition to NT-VTRL and CBD, pyrazofurin, a natural antiviral that has shown effectiveness against SARS-related coronaviruses, was used as a positive control. Glycyrrhizin, a compound that has been used to successfully treat SARS patients, was used as a second positive control. The therapeutic activity of the compounds was evaluated in terms of the cytopathic effect observed under an inverted microscope and with an in vitro cell viability assay. ... "