2-Iminopyrrolidine derivatives

摘要

A 2-iminoimidazole derivative represented by the formula: äwherein R<1>, R<2> and R<3> represent hydrogen, optionally substituted C1-6 alkyl, etc.; R<6> represents hydrogen, C1-6 alkyl, C1-6 alkyloxycarbonyl, etc.; Y<1> represents a single bond, -CH2-, etc.; Y<2> represents a single bond, -CO-, etc.; and Ar represents hydrogen, a group represented by the formula: Äwherein R<10>-R<14> represent hydrogen, C1-6 alkyl, hydroxyl, C1-6 alkoxy, etc., and R<11> and R<12> or R<12> and R<13> may bond together to form a 5- to 8-membered heterocycleÜ, etc.ü or a salt thereof.