Patent ID: 7396939

Claim:
A compound of the formula (I) or salt thereof in which R 1 and R 2 independently of one another are hydrogen, furan-2-yl, tetrahydrofuran-2-yl-methyl, or (C 1 -C 4 )-alkyl, (C 3 -C 4 )-alkenyl, (C 3 -C 4 )-alkynyl, (C 3 -C 6 )-cycloalkyl, (C 3 -C 6 )-cycloalkenyl, (C 3 -C 6 )-cycloalkyl-(C 1 -C 4 )-alkyl or (C 3 -C 6 )-cycloalkenyl-(C 1 -C 4 )-alkyl substituted by m radicals from the group consisting of fluorine, chlorine, bromine, cyano, hydroxyl, (C 1 -C 4 )-alkyl, (C 1 -C 4 )-alkoxy and (C 1 -C 4 )-alkoxy-(C 1 -C 4 )-alkoxy, where R 1 and R 2 are not simultaneously hydrogen, or NR 1 R 2 is a 4- to 7-membered saturated, partially saturated, fully unsaturated or aromatic ring comprising as ring atoms n heteroatoms from the group consisting of nitrogen, oxygen and sulfur which ring is substituted by m radicals from the group consisting of fluorine, chlorine, bromine, iodine, cyano, hydroxyl, trifluoromethyl, nitro, (C 1 -C 4 )-alkyl, (C 1 -C 4 )-alkoxy, fluoro-(C 1 -C 3 )-alkyl, fluoro-(C 1 -C 3 )-alkoxy or (C 1 -C 3 )-alkoxymethyl; R 3 is methyl, ethyl or isopropyl; R 4 is (C 1 -C 4 )-alkyl, (C 3 -C 4 )-alkenyl or (C 3 -C 4 )-alkynyl; R 5 is hydrogen, (C 1 -C 4 )-alkylsulfonyl, (C 3 -C 4 )-alkenylsulfonyl, (C 3 -C 4 )-alkynylsulfonyl, or phenylsulfonyl or benzyl substituted by m radicals from the group consisting of fluorine, chlorine, bromine, cyano, trifluoromethyl, nitro, methyl, ethyl, methoxy and ethoxy, m is 0, 1, 2 or 3; n is 1, 2 or 3.