Patent ID: 8017603

Claim:
A compound of formula (I) or a salt thereof, wherein: R 1 is selected from the group consisting of hydrogen, methyl and trifluoromethyl; R 2 is hydrogen, chloro or fluoro; Ring A is bicyclo[2.2.1]heptanediyl, 1,4-bicyclo[2.2.2]octanediyl, 1,5-bicyclo[3.2.1]octanediyl, 1,5-bicyclo[3.2.2]nonanediyl, 1,5-bicyclo[3.3.2]decanediyl or adamantyl; R 3 is selected from the group consisting of carboxy, —SO 3 H, —S(O) 2 NHR 13 , —S(O) 2 NHC(O)R 13 , —CH 2 S(O) 2 R 13 , —C(O)NHS(O) 2 R 13 , —C(O)NHOH, —C(O)NHCN, —CH(CF 3 )OH, —C(CF 3 ) 2 OH, —P(O)(OH) 2 , R 13 is (1-6C)alkyl, aryl or heteroaryl; R 27 is hydrogen or (1-4C)alkyl; R 4 and R 5 are each independently hydrogen or methyl; and n is 0 or 1.