Patent ID: 7199150

Claim:
A compound of formula (Ia) wherein R 1 and R 2 are each a hydrogen atom; R 3 is a hydrogen atom; R 4 is a C 1 –C 2 alkyl group; n is 2; X is ═N—D, wherein D is a hydrogen atom, a C 1 –C 4 alkyl group or a phenyl group; Y is an ethylene group, an ethynylene group, a group of a formula —CO—CH 2 or a phenylene group; Z is an ethylene group or a trimethylene group; R 5 is an unsubstituted C 3 –C 10 cycloalkyl group, an unsubstituted C 6 –C 10 aryl group, or a C 3 –C 10 cycloalkyl group or a C 6 –C 10 aryl group substituted with from 1 to 3 substituents selected from the group consisting of a halogen atom, a lower alkyl group, a halogeno lower alkyl group and a lower alkoxy group; R 6 and R 7 are each a hydrogen atom; a pharmacologically acceptable salt thereof, or a pharmacologically acceptable ester thereof.