| abstract |
An acridone derivative represented by the following formulan(I) and a pharmacologically acceptable salt thereof areneffective in preventing and curing diseases which are associablenwith histamine, leucotriene, etc. and in preventing and curingnallergic diseases such as asthma, allergic rhinitis, atopicndermatitis, urticaria, valerian fever, digestive tract allergy,nor food allergy.n nwherein R 1 - R 8 severally represent a hydrogen atom, a lower alkylngroup, etc. and n represents an integer of 1 - 6. |