Pyrimidoindolderivate und Verfahren zu ihrer Herstellung

A compound of the formula : wherein R , R and R are each hydrogen, lower alkyl, lower alkenyl, aryl or ar(lower)alkyl, R is imidazolyl which may have suitable substituent(s) or pyridyl, A is lower alkylene, and --- is single bond or double bond, and pharmaceutically acceptable salts thereof, processes for their preparation and pharmaceutical compositions comprising them as an active ingredient.