Patent ID: 6906093

Claim:
A compound having the formula VI or a pharmaceutically acceptable salt thereof, wherein: (a) A 1 , A 2 , A 3 , and A 4 are carbon; (b) R 1 is hydrogen or alkyl; (c) R 2 is oxygen; (d) R 3 is hydrogen; (e) R 4 , R 5 , R 6 , and R 7 are optionally present and are each independently selected from the group consisting of hydrogen, alkyl, alkoxy, aryl, aryloxy, alkaryl, alkaryloxy, halogen, trihalomethyl, S(O)R, SO 2 NRR′, SO 3 R, SR, NO 2 , NRR′, OH, CN, C(O)R, OC(O)R, NHC(O)R, (CH 2 ) n CO 2 R, and CONRR′; (f) n is 0, 1, 2, or 3; (g) R is H, alkyl or aryl; (h) R′ is H, alkyl or aryl; and (i) A is a pyrrole ring, substituted with unsubstituted alkyl at the 3- and 5-positions of the pyrrole ring, and substituted with alkyl, alkoxy, aryl, aryloxy, alkaryl, alkaryloxy, halogen, trihalomethyl, S(O)R, SO 2 NRR′, SO 3 R, SR, NO 2 , NRR′, OH, CN, C(O)R, OC(O)R, NHC(O)R, (CH 2 ) n CO 2 R or CONRR′ at the 4-position of the pyrrole ring.