The present invention relates to a novel cercosporamide derivative, a pharmacologically acceptable salt thereof or an ester thereof which has an excellent hypoglycemic effect and is useful as a therapeutic and/or prophylactic agent for diabetes.
A cercosporamide derivative having the general formula (I):
[wherein X represents an oxygen atom or the like, R
1
represents a hydrogen atom or a C
1
-C
6
alkyl group, R
2
represents a hydrogen atom, a C
1
-C
6
alkyl group or a C
1
-C
6
halogenated alkyl group, R
3
represents a hydrogen atom or a C
1
-C
6
alkyl group, R
4
represents a C
6
-C
10
aryl group which may be substituted with one to five group(s) independently selected from Substituent Group a, or the like, n represents 1, 2 or 3, and Substituent Group a represents a halogen atom, a C
1
-C
6
alkyl group, a C
1
-C
6
halogenated alkyl group, a C
2
-C
6
alkenyl group, a C
2
-C
6
alkynyl group, a C
1
-C
6
alkoxy group, a C
1
-C
6
halogenated alkoxy group, a C
2
-C
6
alkenyloxy group, a C
2
-C
6
alkynyloxy group and the like], a pharmacologically acceptable salt thereof or an ester thereof.