  We investigate scaling rules for the ionization cross sections of
multicharged ions on molecules of biological interest. The cross sections are
obtained using a methodology presented in [Mendez et al. J. Phys B (2020)],
which considers distorted-wave calculations for atomic targets combined with a
molecular stoichiometric model. We examine ions with nuclear charges Z from +1
to +8 impacting on five nucleobases -adenine, cytosine, guanine, thymine,
uracil-, tetrahydrofuran, pyrimidine, and water. We investigate scaling rules
of the ionization cross section with the ion charge and the number of active
electrons per molecule. Combining these two features, we define a scaling law
for any ion and molecular target, which is valid in the intermediate to high
energy range, i.e., 0.2-5 MeV/amu for oxygen impact. Thus, the forty
ion-molecule systems analyzed here can be merged into a single band. We confirm
the generality of our independent scaling law with several collisional systems.
