Patent ID: 7514475

Claim:
A compound of the formula (I): wherein R 1 is a C 1 -C 6 alkyl group, an amino group, a (C 1 -C 6 alkyl)amino group, a di(C 1 -C 6 alkyl)amino group or a nitrogen-containing saturated heterocyclic group; R 2 and R 3 are the same or different and are a hydrogen atom or a C 1 -C 6 alkyl group; Arom is an unsubstituted or substituted aryl group, said aryl group is an aromatic hydrocarbon group having from 5 to 14 carbon atoms; wherein the substituted aryl group is substituted at 1 to 5 positions by substituents which are independently selected from the group consisting of halogen, C 1 -C 6 alkyl, halogeno C 1 -C 6 alkyl, C 1 -C 6 alkoxy, C 1 -C 6 alkylthio, C 1 -C 3 alkylenedioxy, C 1 -C 7 alkanoyl, C 2 -C 7 alkyloxycarbonyl, amino, C 1 -C 7 alkanoylamino, hydroxyl, mercapto, cyano, nitro and carboxyl; A is an ethylene or propylene group; R a is a hydrogen atom, a C 1 -C 6 alkyl group or a C 2 -C 6 alkenyl group; E is an oxygen atom, a sulfur atom or a group of the formula: —NR 4 —, wherein R 4 is a hydrogen atom or a C 1 -C 7 alkanoyl group; X 1 and X 2 are either both an oxygen atom or are both a sulfur atom, or a pharmacologically acceptable salt or ester thereof.