| abstract |
(57) [Summary] (Modified) [Problem] To provide a bronchial agent. A bronchoactive agent comprising a quinone derivative represented by the following general formula (Ia), a hydroquinone derivative thereof, or a salt thereof. Wherein R 1 and R 2 are either a methyl group or a methoxy group, attached R 1 and R 2 together with R 1 and R 2 - R 3 represents an optionally substituted phenyl, naphthyl or thienyl group; R 4 represents a carboxyl group or a group capable of being converted to a carboxyl group in vivo; Represents an integer of 3 to 15. ] |