Patent ID: 7176206

Claim:
A compound having the formula (I) wherein X is oxygen, a hydrazone group, or a guanidinyl group; Y is a halogen; R 1 is selected from the group consisting of H, a C 1 –C 6 alkyl group, a C 1 –C 6 hydroxyalkyl group, a C 1 –C 6 O-alkyl group, a C 2 –C 6 alkylcarbonyl group, a C 1 –C 6 haloalkylcarbonyl group, or an arylsulfonyl group; and R 2 is selected from the group consisting of H, a C 1 –C 6 alkyl group, a C 1 –C 6 hydroxyalkyl group, a C 1 –C 6 O-alkyl group, a C 2 –C 6 alkylcarbonyl group, a C 1 –C 6 alkyloxycarbonyl group, a C 1 –C 6 haloalkylcarbonyl group, or an arylsulfonyl group; or pharmaceutically acceptable salt thereof, with the proviso that the compound is other than a compound of formula (I) where X is O, R 1 is H, and R 2 is H or ethyl.