| abstract |
PROBLEM TO BE SOLVED: To obtain a compound useful as a medicine showing good stability in an aqueous system and good stability in a solid state. SOLUTION: Formula (I) [Wherein R 1 represents a hydrogen atom or the like; A 1 may be an optionally present 1 to 4 substituents, or A 1 represents 2 A 2 represents a substituted or unsubstituted aryl group together with the linking carbon atom; A 2 represents a benzene ring having 1-3 optionally substituted substituents; M - represents a counter ion], provided that 5- [4- [2- (N-methyl-N- (2-pyridyl) amino] ethoxy] benzyl] thiazolidine-2,4 -Excluding dione maleate) or a tautomer thereof and / or a pharmaceutically acceptable solvate thereof, a pharmaceutical composition comprising such a compound. |