This invention relates to bis- and tris-dihydroxyaryl compounds and their methylenedioxy analogs and pharmaceutically acceptable salts and their use in the modulation of Sirtuin 1 (Sirt1) and there use in neuroprotection for subject suffering from neurodegenerative diseases such as Alzheimer's disease, Huntington's disease, Amyotrophic lateral sclerosis, frontotemporal dementia, Parkinson's disease, including Parkinson's plus diseases such as multiple system atrophy, progressive supranuclear palsy, corticobasal degeneration and dementia with Lewy bodies, and in the manufacture of medicaments for such Sirt1 modulation and neuroprotection.