AChE/BuChE/MAO-B-IN-2 (compound 4b) is a potent AChE/BuChE inhibitor and showed good blood brain barrier (BBB) permeability in vitro with an IC 50 value of 5.3 μM, 12.4 μM, 1.9±0.08 μM, for AChE , BuChE , hu MAO-B , respectively. AChE/BuChE/MAO-B-IN-2 (compound 4b) can inhibit excess AChE/BuChE in Alzheimer's disease (AD) brain. AChE/BuChE/MAO-B-IN-2 (compound 4b) can be used in anti-Alzheimer's research.