A series of pyrrolidine derivatives were synthesized and examined for inhibitory activity on detrusor contraction in vivo. Among those compounds, 5, 5-dimethyl-2 (2, 2-diphenylethyl)-3- isopropylidenepyrrolidine hydrochloride (41· HCl), 2-(2, 2-di (4-fluorophenyl) ethylene)-5, 5- dimethyl-3-isopropylidenepyrrolidine hydrochloride (42· HCl),(+)-5, 5-dimethyl-2-(N, N- diphenylaminomethyl)-3-isopropylidenepyrrolidine hydrochloride (+)-(43a· HCl),(-)-5, 5-di- ...