Patent ID: 8227639

Claim:
A compound of formula (I) wherein: R 1 is H; R 2 is H; R 3 , R 4 , R 5 , R 6 and R 7 are independently selected from the group consisting of H, halo, alkylsulfonyl, N-hydroxylsulfonamidyl, perhaloalkyl, nitro, aryl, cyano, alkoxy, perhaloalkoxy, alkyl, substituted aryloxy, alkylsulfanyl, alkylsulfinyl, heterocycloalkyl, substituted heterocycloalkyl, dialkylamino, cycloalkoxy, cycloalkylsulfanyl, arylsulfanyl, arylsulfinyl, carboxyl, carboxyl ester, acylamino and sulfonylamino, provided that at least one of R 3 , R 4 , R 5 , R 6 and R 7 is carboxyl, carboxyl ester, acylamino or sulfonylamino; and provided that when one of R 3 , R 4 , R 5 , R 6 and R 7 is carboxyl, —C(O)O-alkyl or SO 2 NH 2 , then at least one of the remaining R 3 , R 4 , R 5 , R 6 and R 7 is a moiety other than H or halo; or a pharmaceutically acceptable salt thereof.