| abstract |
Compounds of the formula ##STR1## wherein R 1 is aryl which may have one or more suitable substituent(s), n R 2 is aryl which may have one or more suitable substituent(s), lower alkyl or cyclo(lower)alkyl, n R 3 is hydrogen, hydroxy, halogen, lower alkenyl, amino or protected amino, n R 4 is a group of the formula: ##STR2## wherein R 5 is lower alkyl which may have one or more suitable substituent(s), cyclo(lower)alkyl, aryl, ar(lower)alkyl which may have one or more suitable substituent(s), and n R 6 is hydrogen or lower alkyl; or N-containing heterocyclic group which may have one or more suitable substituent(s), and n A is lower alkylene or lower alkynylene, in which R 1 and R 2 may be linked through oxygen atom, their preparation and use in treatment of dysuria, and starting materials for their preparation. |