text: Moreover, the rank order for potency in inhibiting acetylcholinesterase (ambenonium>neostigmine=physostigmine =tacrine>pyridostigmine=edrophonium=<< galanthamine >> >desoxypeganine>parathion>gramine) indicated that the most effective inhibitors of [[ acetylcholinesterase ]] also displaced [3H]-oxotremorine-M to the greatest extent.