Patent ID: 6972299

Claim:
A compound of formula wherein R 1 , R 2 , R 3 , R 4 and R 5 are independently selected from the group consisting of hydrogen, lower alkyl, —(CH 2 ) n -halogen, lower alkoxy, —(CH 2 ) n —NRR′, —(CH 2 ) n —N(R)—C(O)-lower alkyl, or aryl; R, R′ and R″ are independently selected from the group consisting of hydrogen and lower alkyl; R 6 is selected from the group consisting of lower alkyl, —(CH 2 ) n —C(O)OR and halogen; R 7 is selected from the group consisting of lower alkyl, —(CH 2 ) n —C(O)OR′, halogen, and nitro; and R 8 is selected from the group consisting of hydrogen, lower alkyl, —(CH 2 ) n —OH, —(CH 2 ) n —C(O)OR″ or aryl; or a pharmaceutically acceptable salt thereof.