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.