Patent ID: 7432291

Claim:
A compound according to, formula (I), wherein: G is oxygen or sulfur; R 4 is selected from the group consisting of: (a) hydrogen; (b) C 1 -C 3 alkyl; (c) C 1 -C 3 alkoxy; and (d) halogen; and, either: (A) R 1 is selected from the group consisting of: (a) —O-alkyl, wherein the alkyl group is optionally substituted with one or more halogen atoms; (b) —S-alkyl, wherein the alkyl group is optionally substituted with one or more halogen atoms; and (c) —NH-alkyl, wherein the alkyl group is optionally substituted with one or more halogen atoms; R 2 is hydrogen or halogen; and R 3 is hydrogen; or, alternatively, (B) wherein R 1 and R 2 , together with the carbon atoms to which they are attached, form a 5 or 6 membered heterocyclic ring, being optionally once or several times substituted with halogen, and R 3 is hydrogen or halogen; G is oxygen or sulfur; or a pharmaceutically acceptable salt or ester thereof.