Mefloquine enantiomers (+)-1, (-)-1 were found to be stereospecific in their inhibition of acetylcholinesterase and butyrylcholinesterase, (-)-1 being the more potent inhibitor in both cases. Similar observations were also made with respect to (-)-quinine and (+)-quinidine, which are configurational analogues of (+)-1 and (-)-1, respectively. A positive synclinical conformation for the "N-CC -O" segment of mefloquine appeared to be necessary for good activity .

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