| 摘要 |
Selective muscarinic receptor antagonists of formula (I), wherein R1 and R2 are both optionally substituted phenyl, the broken line is an optional bond, X is (a), (b) or CH- when the double bond is absent or is (c) when the double bond is present, X being attached to a carbon atom of A, A is selected from certain piperidine and pyrrolidine groups, n is 1 to 3 and R3 is optionally substituted phenyl or thienyl, pyridyl or pyrazinyl.
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