ACG548B (compound 24) is a potent inhibitor of acetyl- and butyrylcholinesterase (AChE and BChE) with IC50s of 1.78 and 0.496 μM, respectively. ACG548B has higher AChE affinity and selectivity over BChE and ChoK (choline kinase) . ACG548B can be uesd for the study of myasthenia gravis and neuromuscular blockade[1].