Patent ID: 7414076

Claim:
A compound of Formula I: wherein: R 1 is a substituted or unsubstituted bicyclo [2.1.2] heptyl or substituted or unsubstituted adamantyl, wherein said substituted adamantyl is substituted with alkenyl, alkynyl, halogeno, hydroxyl, alkylcarbonyloxy, arylcarbonyloxy, alkoxycarbonyloxy, aryloxy, aryloxycarbonyloxy, carboxylate, alkylcarbonyl, arylcarbonyl, alkoxycarbonyl, aminocarbonyl, alkylaminocarbonyl, dialkylaminocarbonyl, alkylthiocarbonyl, alkoxyl, phosphate, phosphonato, phosphinato, cyano, amino, acylamino, imino, sulfnydryl, alkylthio, arylthio, thiocarboxylate, sulfates, alkylsulfinyl, sulfonato, sulfamoyl, sulfonamido, nitro, trifluoromethyl, cyano, azido, alkylaryl, or aryl; R 2 is hydrogen or alkyl; Y is SO 3 − X + ; X + is hydrogen or a cationic group; and each of L 1 and L 1 is independently a substituted or unsubstituted C 1 -C 5 alkyl group or absent; or a pharmaceutically acceptable salt, ester or prodrug thereof.