QUINOLONE COMPOUND AND PHARMACEUTICAL COMPOSITION

摘要

The present invention provides a quinolone compound represented by Genera l Formula (1) or a salt thereof, wherein R1 represents a hydrogen atom, etc. ; R2 represents a hydrogen atom, etc.; R3 represents a phenyl group optional ly being substituted with one or more substituents, etc.; R4 represents a ha logen atom; R5 represents a hydrogen atom or halogen atom; R6 represents a h ydrogen atom; and R7 represents a hydroxyl group, etc. The quinolone compoun d have a functional improvement effect, which suppresses progression of neur ological dysfunction by inhibiting the chronic progression of Parkinson's di sease or protecting dopamine neurons from the disease etiology, thereby prol onging the period before first administration begins.