Antiviral activity of the four hit compounds and reference compounds against VEEV, EBOV, MARV and LASV infected HeLa cells.

<p>HeLa cells were infected with VEEV (MOI = 0.5 for 20 h), EBOV (MOI = 3 for 48 h), MARV (MOI = 3 for 48 h) or LASV (MOI = 1 for 24 h).</p><p>SI is determined by the formula: CC₅₀/EC₅₀.</p><p>ND, not determined.