Patent ID: 7282510

Claim:
A compound of the formula: where R 1 represents a C 3 -C 9 straight or branched chain alkyl or alkenyl group optionally substituted with C 3 -C 8 cycloalkyl, C 3 or C 5 cycloalkyl, C 5 -C 7 cycloalkenyl, where said alkyl, alkenyl, cycloalkyl, or cycloalkenyl groups may be optionally substituted with C 1 -C 4 alkyl, C 1 -C 4 alkenyl, or hydroxyl; X is oxygen or sulfur; Y is oxygen or NR 2 , where R 2 is hydrogen or C 1 -C 6 alkyl; and Z represents hydrogen (H), or pharmaceutically acceptable salts or hydrates thereof.