| 摘要 |
Soft anticholinergic zwitterions of the formulas: wherein R1 and R2 are both phenyl or one of R1 and R2 is phenyl and the other is cyclopentyl; and wherein each asterisk marks a chiral center; said compound having the R, S or RS stereoisomeric configuration at each chiral center unless specified otherwise, or being a mixture thereof.
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