It is an orally bioavailable, 3-substituted indole derivative (Figure 8A) and microtubule depolymerization agent that recognizes colchicine-binding site on tubulin subunits. It has been under clinical development for cancer [170]. Drugs targeting microtubules have broad antiviral activity because they disrupt the intracellular transport of viruses, including SARS CoV-2, along microtubules, which is critical for viruses to cause infection. Microtubule depolymerization agents also have strong anti-inflammatory effects that can be beneficial in mitigating the cytokine storm induced by SARS-CoV-2 infection [171]. The drug is currently being evaluated in a phase 2 randomized, placebo-controlled study for the treatment of SARS-CoV-2 in patients at elevated risk of acute respiratory distress syndrome (NCT04388826; n = 40). Of note, it is mechanistically similar to colchicine, which has also been considered in COVID-19 patients [172].