Patent ID: 8183212

Claim:
A compound represented by the following formula (1): wherein R 1 is any one kind selected from the group consisting of a 2-pyrrolyl group, a 4-methoxyphenyl group, a 4-chlorophenyl group, and a 4-fluorophenyl group R 2 is any one kind selected from the group consisting of —CO—NH—, —CH═CH—, —SO 2 —NH— and —CH 2 —NH—; R 3 is a methyl group having an aromatic group or a cycloalkyl group; R 4 is any one kind selected from the group consisting of a hydrogen atom, a methyl group, a phenyl group and a benzyl group; when R 2 is —CO—NH—, —SO 2 —NH— or —CH 2 —NH— and the nitrogen atom of R 2 is bonded to R 4 , then —R 2 —CHR 4 — optionally forms wherein R 7 is —CO—, —SO 2 — or —CH 2 —; R 5 is a methyl group having an aromatic group; and R 6 is an amino group or an N-alkyl-substituted amino group.