About this study: If you or your loved one has early stage Alzheimer’s Disease (AD), you may be eligible for this study. This study is evaluating an investigational drug called BPN14770 as a possible treatment for patients with early stage AD. You or your loved one may already be taking a cholinesterase inhibitor such as Aricept® (donepezil), but there is a need to find drugs that may work in other ways. Pharmaceutical companies use clinical studies like this one to learn more about investigational drugs before they are available to the public. Study volunteers can help us in this important research. Thank you for considering participation in this trial. What is the purpose of this study? The purpose of this research study is to test an investigational drug called BPN14770. An investigational drug is one that is not yet approved for sale by the United States Food and Drug Administration (FDA). This study will: Test the safety and effectiveness of the study drug BPN14770. Test