SEARCH Articles Figures Tables 7,8-Dihydrofolate Dihydrofolate inhibition Dihydrofolate reductase Dihydrofolate reductase inhibition Dihydrofolate reductase inhibitors INHIBITION INHIBITOR Inhibition studies Inhibition/inhibitors reductase Inhibitor of dihydrofolate Inhibitor studies Inhibitors of dihydrofolate reductase QSAR QSAR studies