Patent ID: 7018981

Claim:
A compound of general formula (1): wherein R 1 represents an optionally substituted phenyl group or an optionally substituted heterocycle; R 2 represents a hydrogen atom or an optionally substituted amino group; R 3 represents a hydrogen atom, a methyl group or an ethyl group; R 4 represents a hydrogen atom, a methyl group or an ethyl group; R 5 represents a hydrogen atom, a methyl group or an ethyl group; R 6 represents a hydrogen atom, a methyl group, an ethyl group or —CO—R 7 ; R 7 represents a hydrogen atom or a straight or branched alkyl group having 1–3 carbon atoms; V represents a carbonyl group or a methylene group; W represents a carbonyl group or a methylene group: X represents a carbonyl group or a methylene group; Y represents a carbonyl group or a methylene group; Z represents a carbonyl group or a methylene group; m represents a number of 0–2; and n represents a number of 0–3; except for the case where R 1 represents a phenyl group, R 2 represents an amino group, all of R 3 , R 4 , R 5 and R 6 represent a hydrogen atom, V represents a methylene group, all of W, X, Y and Z represent a carbonyl group, and both m and n represent 1; or a hydrate or a pharmaceutically acceptable salt thereof.