Patent ID: 7696235

Claim:
A compound represented by the following formula: wherein R is methyl, ethyl, propyl, isopropyl, n-butyl, isobutyl, pentyl, hexyl, heptyl, octyl, nonyl, or decyl, or R is a polar esterifying group which may be represented by the formula (CHR 1 CHYX) n H wherein X is O or S; Y is selected from the group consisting of H, —OH, —COOH, CONH 2 , SO 3 H and PO 3 H 2 and n is an integer of from 1 to 10, or R is selected from the group consisting of (i) acyl sulfonamide radicals represented by the formula (ii) Sulfonamide radicals represented by the formula SO 2 NR 1 2 and (iii) wherein R 1 is independently selected from the group consisting of hydrogen and alkyl radicals comprised of from 1 to 20 carbon atoms and pharmaceutically-acceptable salts thereof.