Patent ID: 7910593

Claim:
A compound represented by formula (2) or formula (3), or a pharmaceutically acceptable salt, or a hydrate thereof, wherein, R 1 represents a hydrogen atom or C1-C6 alkyl group; X represents a C═O or C1-C3 alkylene group; R 2 and R 4 each independently represents a hydrogen atom, C1-C6 alkyl group, or amino acid side chain; and R 3 represents a C1-C6 alkyl group Y is a group represented by formula (4): wherein, * indicates a linkage site; m is either 0 or 1; R 11 represents a hydrogen atom, halogen atom, or C1-C6 alkyl group; R 12 represents a hydrogen atom, halogen atom, C1-C6 alkyl group, or hydroxyl group; R 13 represents a hydrogen atom, amino group, nitro group, or (dimethylamino)methyl group; R 14 represents a hydrogen atom, C1-C6 alkyl group, (4-methylpiperazinyl)methyl group, or (tert-butoxyimino)methyl group; R 13 and R 14 , and R 11 and R 12 , may, respectively, be linked to each other to form a 5- or 6-membered ring, wherein the skeleton of the 5- or 6-membered ring consists of carbon atoms or carbon atoms and 1 to 2 heteroatoms selected from N, S and O, and the 5- or 6-membered ring may be substituted by 1 to 3 substituents selected from Group A described below, wherein the substituents of Group A may be further substituted by 1 to 3 substituents selected from Group B described below: Group A: a C1-C10 alkyl group, amino group, mono-C1-C8 alkylamino group, di-C1-C8 alkylamino group, C1-C8 alkoxy group, C1-C8 alkylthio group, and group represented by X═ wherein X represents an oxygen atom or sulfur atom; Group B: a C1-C6 alkoxy group, hydroxy group, halogen atom, amino group, mono-C1-C6 alkylamino group, di-C1-C6 alkylamino group, C3-C7 cycloalkyl group, heterocycle, and aryl ring which may comprise 1 to 3 substituents selected from the group consisting of a hydroxy group, C1-C6 alkoxy group, halogen atom, amino group, mono-C1-C6 alkylamino group, and di-C1-C6 alkylamino group; n represents an integer from 1 to 6; and R 5 represents a hydrogen atom or —COOR 6 wherein R 6 represents a hydrogen atom or C1-C6 alkyl group.