Antiviral agents and new agents possessing antiviral properties and ch
aracterized by a carbocyclic (carcass) structure were shown to differ
from other, specifically, heterocyclic compounds, by the presence of a
range from the maximally effective to maximally tolerable concentrati
ons, the antiviral effect decreasing in this range of concentrations.
This feature was observed in cell cultures, chick embryos, and laborat
ory animals in experiments with different influenza viruses and RS vir
us.