IM156 (HL156A; HL271 acetate), a chemical derivative of Metformin (HY-B0627), is a potent AMPK activator that increases AMPK phosphorylation. IM156 attenuates aging-associated cognitive impairment in animal model. IM156 is a potent oxidative phosphorylation (OXPHOS) inhibitor which can be used for the research of solid tumors.