Abstract A number of adamantyl-group-bearing diamino-s-triazines were synthesized as potential dihydrofolate reductase (DHFR) inhibitors and their pharmacological properties were tested. The crystal structures of certain compounds were determined by X-ray crystallography. With the aid of computer graphics, model structures of the L1210 mouse DHFR-ligand ternary complex were constructed. The binding affinities of the compounds ...