| abstract |
Soft anticholinergic zwitterions of the formulas: n n n n n n n n n n wherein R 1 and R 2 are both phenyl or one of R 1 and R 2 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. |