| abstract |
Imidazoquinazoline derivatives represented by general formula (I) or pharmacologically acceptable salts thereof, wherein R1 represents hydrogen, optionally substituted lower alkyl, etc.; R?2 and R3¿ are the same or different and each represents hydrogen, optionally substituted lower alkyl, optionally substituted aralkyl, optionally substituted aryl, etc., or R?2 and R3¿ together form an optionally substituted nitrogenous heterocycle; R4 represents hydrogen or optionally substituted lower alkyl; X represents O or S; Y represents a single bond or O; and n is 0, 1, 2 or 3. |