Compounds, pharmaceutical compositions and methods of inhibiting viral infection in a mammal in need of same, are provided, which employ compounds of the formula wherein each X is independently H or an electrodonating group, each Y is independently H, alkyl of 1-4 carbon atoms, hydroxy, alkoxy or methylene and wherein Substituent Z is a di-or-tri akly amino, or alkyl di or tri amino, optionally substituted with a halogen moiety. This family of compounds, designated FGI-104 herein, inhibits viral infection therapeutically and prophylactically.