PROBLEM TO BE SOLVED: To elucidate the physiological characteristics concerning a certain oxophosphorus compound and to thereby develop novel and useful applications of the compound.SOLUTION: The pharmaceutical agent contains as an active ingredient an oxophosphorus compound represented by formula A or formula B (wherein R1 is a hydrocarbon group or a substituted hydrocarbon group R2 and R3 are each a hydrogen atom, a hydrocarbon group, or a substituted hydrocarbon group and R4 and R5 are each a hydroxyl group, an alkyl group, an alkoxyl group, or an aryl group).COPYRIGHT: (C)2007,JPO&INPIT【課題】ある種のオキソリン化合物についての生理的特性を解明し、その新規かつ有用な用途開発を目的とする。【解決手段】一般式又は(式中のR1は炭化水素基又は置換炭化水素基、R2及びR3はそれぞれ水素原子、炭化水素基又は置換炭化水素基、R4及びR5は水酸基、アルキル基、アルコキシ基又はアリール基)で表わされるオキソリン化合物を有効成分として含有する医薬とする。【選択図】なし