Patent ID: 7183317

Claim:
A compound of the formula: wherein X=CH 2 C(O) 2 R, C(O) 2 R, or C(O)NR 1 R 2 ; n=1, 2, 3, 4, or 5; m=2, 3, 4, 5, 6, or 7; and R, R 1 and R 2 are independently hydrogen, or alkyl, aryl, aralkyl, or alkaryl, which can be optionally substituted with one or more moieties selected from the group consisting of hydroxyl, carboxy, carboxamido, carboalkoxy, acyl, amino, halo, alkylamino, arylamino, alkoxy, aryloxy, nitro, cyano, sulfonic acid, sulfate, phosphonic acid, phosphate, and phosphonate; or its pharmaceutically acceptable salt.