Noun
A
synthetic
analog
of
guanosine
with
chemical formula
C
<
sub
>
8
sub
>
H
<
sub
>
12
sub
>
N
<
sub
>
4
sub
>
O
<
sub
>
5
sub
>
that
inhibits
viral
nucleic acid
synthesis
and
is
used
as
a
broad-spectrum
antiviral
drug
especially
in
the
treatment
of
infection
and
chronic
hepatitis C
.