Monoamine Oxidase B inhibitor 2 is a potent, reversible, orally active and selective monoamine oxidase B ( MAO-B ) inhibitor with an IC 50 of 1.33 nM. Monoamine Oxidase B inhibitor 2 has antioxidant and anti-neuroinflammatory activities. Monoamine Oxidase B inhibitor 2 can across the blood-brain barrier (BBB), and can be used for Parkinson’s disease study.