Table 1.

Chemical structures and nomenclatures of both prodrug/salt and active/base forms of cyanorona-20, its parent drug favipiravir, and its three reference antiviral drugs (remdesivir, arbidol, and hydroxychloroquine)

Compound name	Administered prodrug/salt form	Active metabolite/free base form
Cyanorona-20
Favipiravir
Remdesivir
Arbidol
Hydroxychloroquine