Patent ID: 8013187

Claim:
A compound represented by Formula I provided below, or a pharmaceutically acceptable salt thereof: wherein, R 1 represents a linear or branched C 1 -C 10 alkyl group, or a C 3 -C 7 cycloalkyl group; and R 2 represents an aromatic group selected from the group consisting of phenyl, pyridyl, naphthyl, indolyl, thienyl, benzo[b]thienyl, dibenzofuranyl, and thianthrenyl, wherein said phenyl is unsubstituted or substituted by: one to three substituent(s) selected from the group consisting of a linear C 1 -C 9 alkyl group, phenyl, halo, nitro, alkoxy, cyano and hydroxy, or one substituent selected from the group consisting of alkenyl, haloalkyl, amino, alkylamino, alkylaminoalkyl, methylenedioxy, haloalkoxy, benzyloxy, alkylthio, alkylsulfonyl, alkylsulfinyl, alkoxycarbonyl, alkoxyalkyl, hydroxyalkyl, carbamoyl, N-hydroxy-iminoalkyl and N-(N-hydroxy-iminoalkyl).