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J Med Chem. 2000 Jun 29;43(13):2514-22.6beta-Acyloxy(nor)tropanes: affinities for antagonist/agonist binding sites on transfected and native muscarinic receptors.
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J Med Chem. 1998 Jun 4;41(12):2047-55.6beta-Acetoxynortropane: a potent muscarinic agonist with apparent selectivity toward M2-receptors.