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.