Departments of Chemistry and Biochemistry, Metabasis Therapeutics, Inc., 11119 North Torrey Pines Road, La Jolla, California 92037 * To whom correspondence should be addressed. Phone: 858-622-5530 .

† Center of Excellence for Aging and Brain Repair, Department of Neurosurgery and Brain Repair, USF Health College of Medicine, University of South Florida, Tampa, Florida 33612, United States ‡ ...