Aminomethylpyrrolidine derivatives substituted cycloalkyls.

This invention provides a quinolone derivative which exerts strong antibacterial action upon various bacteria and has high safety, and it relates to a compound having a structure of formula (I), its salts and hydrates thereof: aR and R : hydrogen, alkyl; n: 1 to 4; Q: following structure (Ia): AR : alkyl, alkenyl, halogenoalkyl, cyclic alkyl, aryl, heteroaryl, alkoxyl, alkylamino; R : hydrogen, alkylthio; R : hydrogen, amino, hydroxyl, thiol, halogenomethyl, alkyl, alkenyl, alkynyl, alkoxyl; X : halogen, hydrogen, A : nitrogen, structure of formula (II): (X : hydrogen, amino, halogen, cyano, halogenomethyl, halogenomethoxyl, alkyl, alkenyl, alkynyl, alkoxyl; R and R or X and R may together form a cyclic structure; Y: hydrogen, various ester forming groupsUu.