The methotrexate analogs 7-d-MTX, 7,9,9-d.sub.3 -MTX, MTX halogenated or possessing some other such group at the 7-position capable of reducing oxidation to 7-OH-MTX, and structurally related analogs, as well as pharmaceutical compositions containing the analogs, the synthesis of the MTX analogs, and use of the analogs in modulating cellular function.