Researchers at F. Hoffmann-La Roche Ltd. and Hoffmann-La Roche Inc. have described haloacethydrazide compounds acting as legumain (asparaginyl endopeptidase; LGMN; AEP) inhibitors reported to be useful for the treatment of subacute sclerosing panencephalitis, progressive supranuclear palsy, frontotemporal dementia and Alzheimer's disease, among others.