Patent ID: 8143445

Claim:
A compound having the structure wherein n is 3-10; X is C—R 11 or N, wherein R 11 is H, OH, SH, F, Cl, SO 2 R 7 , NO 2 , trifluoromethyl, methoxy, or CO—R 7 , wherein R 7 is alkyl, alkenyl, alkynyl, C 3 -C 8 cycloalkyl, or aryl; Z is R 2 is H or NR 3 R 4 , wherein R 3 and R 4 are each independently H, C 1 —C 6 alkyl, or C 3 —C 8 cycloalkyl; R 5 is OH or SH; R 6 and R 12 are each independently H, OH, SH, F, Cl, SO 2 R 15 , NO 2 , trifluoromethyl, methoxy, or CO—R 15 , wherein R 15 is alkyl, alkenyl, alkynyl, C 3 -C 8 cycloalkyl, or aryl; and R 13 and R 14 are each independently H, SH, F, Cl, SO 2 R 15 , NO 2 , trifluoromethyl, methoxy, or CO—R 15 , wherein R 15 is alkyl, alkenyl, alkynyl, C 3 —C 8 cycloalkyl, or aryl, or a salt of the compound.