| abstract |
The present invention relates to a compound of formula (I): R 1 —NH—X—Y—Z (I) (Wherein each symbol is as defined above) And an pharmaceutically acceptable salt thereof, and an aqueous composition comprising an additive selected from the group consisting of a polyol, a sugar, a sugar alcohol, boric acid or a salt thereof, and water. This aqueous composition is very stable and can be stored for a long time. |