Patent ID: 7572921

Claim:
A compound of formula I wherein: X is —CH 2 —, Y is a group of the formula —NR 7 —, wherein R 7 is (A) hydrogen atom or (B) C 1-3 alkyl group optionally substituted with: (i) oxo, or (ii) a group of the formula —NR 9 R 10 , wherein R 9 and R 10 are each independently: (a) a hydrogen atom, (b) a C 1-2 alkylcarbonyl group, or (c) a C 1-2 alkyloxycarbonyl, Z is —CH 2 —, R 1 is phenyl optionally substituted with one to two fluorine atoms, R 2 is a chlorine atom, R 3 is a hydrogen atom, and R 4 is a chlorine atom; or a pharmaceutically acceptable salt or ester thereof.