Statistical design in principal properties based on D-optimality crite
ria are particularly appropriate for selecting the most informative mo
lecules to be synthesized and tested in the framework of QSAR studies.
Selection by D-optimal designs are better than those based on fractio
nal factorial designs since they allow one to reduce the number of req
uired structures, to reduce polysubstitution, to exclude molecules too
difficult to synthesize and to include molecules already available an
d/or tested.