Patent ID: 7345082

Claim:
A compound of formula I wherein R 1 is a group of formula (a) R 7 is hydrogen, (C 1 -C 5 )-alkyl or O—(C 1 -C 4 )-alkyl; R 8 is OH, pyrrolidonyl or —C(O)NR 5 R 6 wherein R 5 is hydrogen or (C 1 -C 5 )-alkyl and R 6 is (C 1 -C 5 )-alkyl or (C 1 -C 5 )-alkyl substituted by phenyl; and R 9 is hydrogen or (C 1 -C 5 )-alkyl; or R 1 is indolyl substituted by (C 1 -C 5 )-alkyl, or quinolinyl; R 2 is (C 1 -C 5 )-alkyl or phenyl; R 3 is hydrogen, (C 1 -C 5 )-alkyl, O—(C 1 -C 5 )-alkyl or phenyl; R 4 is (C 1 -C 6 )-alkyl, (C 3 -C 6 )-cycloalkyl, phenyl, pyridyl, or indolyl; or a pharmaceutically acceptable salt thereof.