Soft anticholinergic esters of the formulas (Ia) or (Ib): wherein R1 and R2are both phenyl or one of R1 and R2 is phenyl and the other is cyclopentyl； Ris C1-C8 alkyl, straight or branched chain； and X" is an anion with a singlenegative charge； and wherein each asterisk marks a chiral center； saidcompound having the R, S or RS stereoisomeric configuration at each chiralcenter unless specified otherwise, or being a mixture thereof.
