 This non-placebo controlled trial will be conducted in one to three clinical centers. Thirty six 36 patients with mild-to-moderate Alzheimers disease will be randomly assigned to once daily, orally administered treatment with 3mg, 10mg, 30mg or 90mg doses of T3D-959. Participants will be treated for two weeks and will undergo at baseline and at two weeks; FDG-PET scans to measure brain glucose metabolism, BOLD fMRI scans to measure functional connectivity of the hippocampus, venous blood draws for biomarker analysis and ApoE genotyping, and ADAS-Cog11 and DSST cognitive testing. For monitoring potential toxicities of the drug subjects will undergo physical examination, neurological examination, adverse event review, blood chemistries, and pharmacokinetic PK analyses for T3D-959 plasma levels. 